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• bash find xargs grep only single occurence

  - by keftebub

  hi. maybe it's a bit strange - and maybe there are other tools to do this but, well.. i am using the following classic bash command to find all files which contain some string: find . -type f | xargs grep "something" i have a great number of files, on multiple depths. first occurence of "something" is enough for me, but find continues searching, and takes a long time to complete the rest of the files. what i would like to do is something like a "feedback" from grep back to find so that find could stop searching for more files. is such a thing possible? thank you

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• Move/copy files/folder in linux/solaris using only bash built-ins

  - by KullDox

  There was a situation when somebody moved the whole rootdir into a subdir on a remote system, thus all the system tools like cp, mv, etc didn't work anymore. We had an active session though but couldn't find a way to copy/move the files back using only bash built-ins. Do somebody know of a way to achieve this? I even thought about copy the cp or mv binary in the currentdir with while read -r; do echo $LINE; done and then redirect this to a file, but it didn't work. Guess because of all the special non printable chars in a binary file that can't be copied/displayed using echo. thanks.

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• Bash script to (more or less) reliably check if the internet is up

  - by João Portela

  I need a bash script to put in a cron job that every minute checks if the internet is up. This is how I did it: #! /bin/sh host1=google.com host2=wikipedia.org curr_date=`date +"%Y%m%d%H%M"` echo -n "${curr_date};" ((ping -w5 -c3 $host1 || ping -w5 -c3 $host2) > /dev/null 2>&1) && echo "up" || (echo "down" && exit 1) How would you do it? Which hosts would you ping? Thanks in advance.

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• Use a cat + grep as an included source in bash

  - by Andrew

  I'm on a shared webhost where I don't have permission to edit the global bash configuration file at /ect/bashrc. Unfortunately there is one line in the global file, mesg y, which puts the terminal in tty mode and makes scp and similar commands unavailable. My local ~./bashrc includes the global file as a source, like so: # Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi My current workaround uses cat and grep to output the global file, sans offending line, into a local file and use that as a source. # Source global definitions if [ -f /etc/bashrc ]; then cat /etc/bashrc | grep -v mesg > ~/.bash_global . ~/.bash_global fi Is there a way to do include a grokked file like this without the intermediate step of creating an actual file? Something like this? . cat /etc/bashrc | grep -v mesg > ~/.bash_global

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• Variable loss in redirected bash while loop

  - by James Hadley

  I have the following code for ip in $(ifconfig | awk -F ":" '/inet addr/{split($2,a," ");print a[1]}') do bytesin=0; bytesout=0; while read line do if [[ $(echo ${line} | awk '{print $1}') == ${ip} ]] then increment=$(echo ${line} | awk '{print $4}') bytesout=$((${bytesout} + ${increment})) else increment=$(echo ${line} | awk '{print $4}') bytesin=$((${bytesin} + ${increment})) fi done < <(pmacct -s | grep ${ip}) echo "${ip} ${bytesin} ${bytesout}" >> /tmp/bwacct.txt done Which I would like to print the incremented values to bwacct.txt, but instead the file is full of zeroes: 91.227.223.66 0 0 91.227.221.126 0 0 127.0.0.1 0 0 My understanding of Bash is that a redirected for loop should preserve variables. What am I doing wrong?

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• How to create a bash function with variable parameters/arguments to grep several keywords/tags

  - by CornSmith

  I'm using the :!grep "tag1" filename | grep "tag2" filename | grep -n "tag3 or more" filename command in vim to search for my code snippets based on their tags (a simple comment at the top of a snippet) in one big file. I use snippets to remember tricky things. This is painful to write out each time. I'd like to make an alias, or function to do something like this: :!greptag tag1 tag2 ... tag39 And it should search the current doc and return the lines with all the tags on them. Vim is set to interactive shell mode so that it can parse my bashrc for aliases/functions. set shellcmdflag=-ic How can I construct a function that allows for variable arguments like this in bash?

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• BASH Script to cd to directory with spaces in pathname

  - by Rails Newbie

  Argggg. I've been struggling with this stupid problem for days and I can't find an answer. I'm using BASH on Mac OS X and I'd like to create a simple executable script file that would change to another directory when it's run. However, the path to that directory has spaces in it. How the heck do you do this? This is what I have... Name of file: cdcode File contents: cd ~/My Code Now granted, this isn't a long pathname, but my actual pathname is five directories deep and four of those directories have spaces in the path. BTW, I've tried cd "~/My Code" and cd "~/My\ Code" and neither of these worked. If you can help, THANKS! This is driving me crazy!!

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• Modify bash variables with sed

  - by Alexander Cska

  I am trying to modify a number of environmental variables containing predefined compiler flags. To do so, I tried using a bash loop that goes over all environmental variables listed with "env". for i in $(env | grep ipo | awk 'BEGIN {FS="="} ; { print $1 } ' ) do echo $(sed -e "s/-ipo/ / ; s/-axAVX/ /" <<< $i) done This is not working since the loop variable $i contains just the name of the environmental variable stored as a character string. I tried searching a method to convert a string into a variable but things started becoming unnecessary complicated. The basic problem is how to properly supply the environmental variable itself to sed. Any ideas how to properly modify my script are welcome. Thanks, Alex

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• Print a file skipping X lines in Bash

  - by Eduardo

  Hi I have a very long file which I want to print but skipping the first 1e6 lines for example. I look into the cat man page but I did not see nay option to do this. I am looking for a command to do this or a simple bash program. I know how to do it using a program in C but I want to do it using the common commands. Any way to do it? Thanks a lot in advance..

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• read in bash on tab-delimited file without empty fields collapsing

  - by Charles Duffy

  I'm trying to read a multi-line tab-separated file in bash. The format is such that empty fields are expected. Unfortunately, the shell is collapsing together field separators which are next to each other, as so: # IFS=$'\t' # read one two three <<<$'one\t\tthree' # printf '<%s> ' "$one" "$two" "$three"; printf '\n' <one> <three> <> ...as opposed to the desired output of <one> <> <three>. Can this be resolved without resorting to a separate language (such as awk)?

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• bash script to find/grep particular string in xml files in particular folders

  - by user3702188

  i have a problem at work, where i need to simplify the process how i searrh for logs. I would like to ask for help from experts here. We have different services for every channel. The structure is following: - root/channel_1/service_1/2014-05-21/file_54544654541.xml - root/channel_1/server2_2/2014-05-20/file_74272172.xml - root/channel_1/service_3/2014-05-22/file_45456546.xml - root/channel_2/service_4/2014-05-23/file_78754456.xml - root/channel_2/service_5/2014-05-24/file_546546546.xml my main problem is to find particular string in these xml files. Lets say, i know the channel name but i dont know the service name under which my particular string should be present. Also i know the date. So in search i want to enter the channel name the date and string. The search would be going via all service folders and looking for string only in all xml files under particular date folder and particular channel. any ideas for quickest and easiest solution to achieve this? Either by bash or perl? Any help would be appreciated thanks

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• Using read in bash without empty fields collapsing

  - by Charles Duffy

  I'm trying to read a multi-line tab-separated file in bash. The format is such that empty fields are expected. Unfortunately, the shell is collapsing together field separators which are next to each other, as so: # IFS=$'\t' # read one two three <<<$'one\t\tthree' # printf '<%s> ' "$one" "$two" "$three"; printf '\n' <one> <three> <> ...as opposed to the desired output of <one> <> <three>. Can this be resolved without resorting to a separate language (such as awk)?

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• generate php classes in bash

  - by Derek

  i have this script: #!/bin/bash if [[ -z "$1" ]] ; then echo "Class is required" exit 1; fi if [[ -z "$2" ]] ; then package="Default" else package=$2; fi echo "<?php /** * $1.class.php * * Vcard class file. * @name Project * @author Author * @link http://www.domain.com * @copyright Copyright © 2011 * @package $package * @version 1.0 */ /** * The main $1 class * @package $package */ class $1 { /** * Constructor setup. */ public function __construct() { } /** * Destructor setup. */ public function __destruct() { } } " > $1.class.php php -l $1.class.php echo "Done"; if i do: ./generate.sh my_class it creates everything with my_class. how can i modify this to: MyClass? i need to use MyClass for the filename, and the class name etc... later in the code i use the argument (in this case my_class) for some other purposes. thanks

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• bash copy with variable

  - by zaf

  I'm trying to copy files to the current directory using a bash script. In order to handle paths that need escaping a variable is used that is escaped and then supplied to the cp command. The cp command is complaining with: usage: cp [-R [-H | -L | -P]] [-fi | -n] [-apvX] source_file target_file cp [-R [-H | -L | -P]] [-fi | -n] [-apvX] source_file ... target_directory I know what that means but I cannot understand why that happens. Here is the code: z="/a/b/c d e f.txt" y=`printf %q "$z"` cp $y x.txt # not working as expected echo cp $y x.txt # output is "cp /a/b/c\ d\ e\ f.txt x.txt"

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• Extract substructure from a text file using bash or python

  - by Werner

  Hi, I have a huge text file, which follows the structure: SET TAG1 ... ... SET ... SET TAG2 ... ... SET ... ... I would like to extract for a specific TAG, (i.e. TAG54) its individual "substructure", which would be SET TAG54 ... ... SET Each substructure, for a given TAG_i contains always: first line:SET second line:TAG_i (in this case TAG54) an arbitrary number of lines last line:SET I wonder what would be the best way to do this, whether in bash or python, so for a given TAG, one can "extract" this substructure. Thanks

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• String Manipulation in Bash

  - by user348000

  Hello- I am a newbie in Bash and I am doing some string manipulation. I have the following file among other files in my directory: jdk-6u20-solaris-i586.sh I am doing the following to get jdk-6u20 in my script: myvar=`ls -la | awk '{print $9}' | egrep "i586" | cut -c1-8` echo $myvar but now I want to convert jdk-6u20 to jdk1.6.0_20. I can't seem to figure out how to do it. It must be as generic as possible. For example if I had jdk-6u25, I should be able to convert it at the same way to jdk1.6.0_25 so on and so forth Any suggestions?

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• Silent application installation script

  - by Achu

  I use the following script to install application from the server: ECHO OFF IF EXIST "C:\SCRIPTS\drvsw01.cmd" GOTO :L1 C: LABEL System_Drive CD\ MD SCRIPTS COPY U:\Scripts\*.* C:\SCRIPTS\ install.exe -i silent -DLICENSE_ACCEPTED=true -f response_file ECHO "SCRIPTS FOLDER INSTALLATION SUCCESSFUL" :L1 ECHO "JAVA INSTALLATION" U:\Softwares\Java_Run_Time\jre-6u26-windows-i586.exe ECHO "JAVA INSTALLATION SUCCESSFUL" ECHO "OFFICE SOFTWARE INSTALLATION" ECHO "MS OFFICE INSTALLATION" U:\Softwares\Office_2007\setup.exe ECHO "MS-OFFICE INSTALLATION SUCCESSFUL" U:\Softwares\SaveAsPDFandXPS.exe ECHO "MS-OFFICE PDF%XPS Add in INSTALLATION SUCCESSFUL" ECHO "NETWORK SCAN GEAR INSTALLATION" U:\Softwares\ScanGear\english\DISK1\setup.exe ECHO "NETWORK SCAN GEAR INSTALLATION SUCCESSFUL" ECHO "7ZIP INSTALLATION" U:\Softwares\7ZIP\7z457.EXE E CHO "7ZIP INSTALLATION SUCCESSFUL" ECHO "IFAN VIEW INSTALLATION" U:\Softwares\IrfanView_4.5\iview425_setup.exe ECHO "IFAN VIEW INSTALLATION SUCCESSFUL" U:\Softwares\IrfanView\irfanview_plugins_425_setup.exe ECHO "IFAN VIEW PLUGINS INSTALLATION SUCCESSFUL" U:\Softwares\Firefox4\Firefox4.exe ECHO "FIREFOX INSTALLATION SUCCESSFUL" ECHO "FIREFOX PLUGIN INSTALLATION" U:\Softwares\Flash_Player_10\install_flash_player.EXE U:\Softwares\Flash_Player_10\install_flash_player_10_active_x.exe ECHO "FIREFOX INSTALLATION SUCCESSFUL" ECHO "ACROBAT READER 10 INSTALLATION" U:\Softwares\Adobe_Acrobat_Reader_10\AdbeRdr10.exe ECHO "ACROBAT 10 Installation SuccESSFUL" ECHO "INSTALLATION CD burner WINDOWS XP" U:\Softwares\CDburnerxpsetup.exe ECHO "Installation of CD burner Successful" ECHO "INSTALLATION IE8 for WINDOWS XP" U:\SOFTWARE\IE8\IE8-WindowsXP-x86-ENU.exe ECHO "INSTALLATION IE8 SUCCESSFUL" ECHO "THE USER ACCOUNT WOULD BE DELETED" NET USER USER /DELETE ECHO "USER ACCOUNT DELETE SUCCESSFUL" echo %ERRORLEVEL% Now, i want to make this script installing everything silently except MS-Office. Ms-Office b/c i have to customize installing only word, excel & powerpoint. How can i make this script silent? or are there a nice script for this? Thanks,

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• rm failing inside cron script

  - by Nicholas

  I have a cron job calling a bash script which runs fine, except for one line inside it that is suppose to remove all fines in a directory. The result of this line is always 'no such file or directory' even though I have verified (many times) that there are files in that directory. The line in question is as simply: rm /dir1/dir2/dir3/* The script works fine when run manually in the terminal, so it must be something about how the cron is run. I've tried giving 'dir3' and all the files inside it every permission possible, so it shouldn't be a permission problem. (The directory and files are also owned by the user). I've tried specifing 'SHELL=/bin/bash' inside 'crontab'. There is no sticky bit set and there is no alias on the rm command. Interestingly changing the 'rm' command to 'ls' gives the same negative result (unless you remove the trailing '*', and then that works). What am I missing here?

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• Script errors when run by launchd at startup, but not when run in Terminal

  - by Mechcozmo

  Hello. I'm attempting to create a RAM disk that loads the previous contents when the system starts up, and every six hours writes the contents to a disk image. Currently, when you run the script from the terminal ("sudo bash LogToRAM.sh") everything works fine. But when run from launchd during startup, it doesn't work. Here's the lines from the log; the first line just gives some idea as to where in the boot process we are: SecurityAgent[202] Showing Login Window com.mechcozmo.LogToRAM[51] + /Developer/usr/bin/SetFile -a V /Volumes/LogfileRAMdisk com.mechcozmo.LogToRAM[51] ERROR: File Not Found. (-43) on file: /Volumes/LogfileRAMdisk com.mechcozmo.LogToRAM[51] + /usr/sbin/asr -source '/Library/Application Support/LogToRAM/RAMdisk_store.dmg' -target /Volumes/LogfileRAMdisk/ -noverify Here is the script and plist file in question. Note that 'set -vx' is up at the top of the script; it give a lot of information about what is happening in the script. My current theory is that the /Volumes directory does not exist at this stage of the boot process, but that seems unlikely to be honest.

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• How do I make zsh completion act more like bash completion?

  - by Tordek

  I'm a recent convert from bash to zsh (which I'm using "oh my zsh" with), but one thing annoys me: When I hit the tab key, the first autocompletion is filled out automatically, and you need to cycle through the completions by hitting tab repeatedly. This differs from bash, where you are just shown a list of the completions. If all completions have the same prefix, then this prefix is filled out. You can select the one you want by continuing to type. I find the latter preferable since it is faster to type, than to select a completion by hitting tab repeatedly. Is there any way to make zsh completion act more like bash in this regard?

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• Bash script to open, read, and write then save....

  - by Alex Vo

  I'm new on this bash script thing. Can you show me some example on writing Bash script. I want to write a script that can read from a filename and save it to a variable; increment the value of the variable and write that variable back to the file and save it. This is what I have started and stuck on it so far. #!/bin/bash # if file exist #echo "Testing \ "$1"" if [ -f "$1" ]; then echo "$1 does exist" else echo "$1 does not exist!" echo "Creating $1" touch $1 echo "This is test" > $1 exit 1 fi #echo "Testing \ "$2"" if [ "$2" == "" ]; then echo "Enter the filename" elif [ -f "$2" ]; then echo "$2 Fille does exist" else echo "$2 File doesn't exist" echo "Creating $2" touch $2 exit 1 fi counter=1 echo -n "Enter a file name : " read file if [ ! -f $file ] then echo "$file not a file!" exit 1 fi

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• Has anyone found a (eg bash) shell terminal for Windows as good as the OS X one?

  - by Anentropic

  I am mostly using 'git-bash' which came with the Windows install of Git vcs. I think it is the same one that comes with Cygwin. It works fine technically but the UI sucks: have to right-click the title bar and go to Properties to change the window width most annoyingly... copy and paste and highlight with the mouse are equally cumbersome In contrast, the Terminal app that comes with OS X manages these with aplomb and makes it so much more comfortable to work with. You can even drag and drop a file on it and it will paste the file path in at your cursor! I have also tried: http://sourceforge.net/projects/win-bash http://www.steve.org.uk/Software/bash/ http://www.hamiltonlabs.com/cshell.htm None of these do copy and paste of text without cumbersome right-clicking. I am specifically looking for a Unix-flavoured shell in Windows so I don't have to use different shells between my home dev (Windows), the live server (Linux) or dev at the office (Mac). Yes I have Googled and haven't found one yet...

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• strange behavior

  - by lego69

  I wrote simple script test echo hello <-- inside test if I press one time enter after hello, my script will run, if I don't press - it will not, if two times I'll receive my hello and + command was not found, can somebody please explain me this behavior thanks in advance

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• nvcc not found, but only when using sudo

  - by dsp_099

  I can't get ANYTHING working on linux. I'm trying to compile CudaMiner. sudo make: ypt-jane.o `test -f 'scrypt-jane.cpp' || echo './'`scrypt-jane.cpp mv -f .deps/cudaminer-scrypt-jane.Tpo .deps/cudaminer-scrypt-jane.Po nvcc -g -O2 -Xptxas "-abi=no -v" -arch=compute_10 --maxrregcount=64 --ptxas-options=-v -I./compat/jansson -o salsa_kernel.o -c salsa_kernel.cu /bin/bash: nvcc: command not found make[2]: *** [salsa_kernel.o] Error 127 make[2]: Leaving directory `/var/progs/CudaMiner' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/var/progs/CudaMiner' make: *** [all] Error 2 So, kind of interesting: nvcc: nvcc fatal : No input files specified; use option --help for more information Whereas sudo nvcc: sudo: nvcc: command not found Huh?? I have identical exports listed in ~/.bashrc AND /etc/bash.bashrc. (Nvcc is located in: /usr/local/cuda-5.0/bin/nvcc) I also tried changing the current path, to no avail: $ sudo bash -c 'echo $PATH' /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin $ PATH=$PATH:/usr/local/cuda-5.0/bin/nvcc $ sudo bash -c 'echo $PATH' /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin Thanks in advance!

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• what could cause a script to fail to find python when it has `#!/usr/bin/env python` in the first line?

  - by jcollum

  Trying to get casperjs running on Ubuntu 12.04. After installing it when I run I get: 09:20 $ ll /usr/local/bin/casperjs lrwxrwxrwx 1 root root 26 Nov 6 16:49 /usr/local/bin/casperjs -> /opt/casperjs/bin/casperjs 09:20 $ /usr/bin/env python --version Python 2.7.3 09:20 $ cat /opt/casperjs/bin/casperjs | head -4 #!/usr/bin/env python import os import sys 09:20 $ casperjs : No such file or directory 09: 22 $ python Python 2.7.3 (default, Sep 26 2013, 20:03:06) [GCC 4.6.3] on linux2 So Python is present and runnable, casperjs is pointing to the right place and it is a python script. But when I run it I get "No such file". I can fix it by changing the first line of the casperjs python file from: #!/usr/bin/env python to: #!/usr/bin/python Result: $ casperjs --version 1.1.0-DEV I managed to fix it, but I'm wondering why it didn't work with #!/usr/bin/env python, since that seems to be a normal interpreter line. Do I have something configured wrong? Here are the steps to get casperjs: $ git clone git://github.com/n1k0/casperjs.git $ cd casperjs $ ln -sf `pwd`/bin/casperjs /usr/local/bin/casperjs $ casperjs : No such file or directory

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