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  • Is it possible to run bash builtin from non bash script?

    - by tig
    Is it possible to run for example history -w for underlying bash shell from ruby script? Or better is it possible to run builtin command for bash shell knowing only its pid? The only way I found is to trap signal like trap "history -w" SIGUSR1 and then send signal to process, but I am not sure that it is a good practice and USR1 is not used by bash, also this way I can execute max 2 commands (USR1 and USR2). And I have to define trap before using it. I am on Mac so there is not SIGRTMIN..SIGRTMAX.

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  • Unique Features of bash compared to zsh

    - by Tim
    I have been a zsh user for quite some time (before that tcsh and before that csh). I am quite happy with it, but was wondering if there are any compelling features of bash that do not exist in zsh. And conversely, are there zsh features which do not exist in bash. My current feel is that bash is better: If you are familiar with it already and don't want to learn new syntax. It is going to exist on most all *nix machines by default, whereas zsh may be an extra install. Not trying to start a religious battle here, which is why I'm just looking for features which exist in only one of the shells.

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  • Execute background program in bash without job control

    - by Wu Yongzheng
    I often execute GUI programs, such as firefox and evince from shell. If I type "firefox &", firefox is considered as a bash job, so "fg" will bring it to foreground and "hang" the shell. This becomes annoying when I have some background jobs such as vim already running. What I want is to launch firefox and dis-associate it with bash. Consider the following ideal case with my imaginary runbg: $ vim foo.tex ctrl+z and vim is job 1 $ pdflatex foo $ runbg evince foo.pdf evince runs in background and I get me bash prompt back $ fg vim goes foreground Is there any way to do this using existing program? If no, I will write my own runbg.

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  • Writing my first bash script (line 2: testscript: No such file or directory)

    - by skyeagle
    I am attempting to write my first shell script (I'm running Ubuntu 10.x) This is what my 'script' looks like cd /path/to/directory/cronscripts . testscript I put the following debug statements (after the cd), in the script above to make sure everything was ok: pwd echo `ls -lhrt` and it displayed all the files in the directory. So I dont understand the error message I am getting. I have the following two questions Why am I getting the above error message and how do I fix it? My script seems to run fine without a shebang in the first line - infact when I try either of the following: #!/usr/bin/bash #!/usr/bin/bash env I get the following error message: /usr/bin/bash: bad interpreter: No such file or directory What is the purpose of the shebang statement and why do I get the above error when I try to include it in my script/ how do I fix it, so I can add the shebang (is it necessary? - it seems most script examples have the shebang - but I'm not sure if it is a must, as the script runs without it).

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  • Empty /var/log after running cron bash script

    - by Ortix92
    I wrote a little bash script and all of a sudden my /var/log folder is completely empty except for the log I created for the bash script. This is the script I'm running every hour with cron: #!/bin/bash STL_DIR=/path/to/some/folder/i/hid LOGFILE=/var/log/stl_upload.log now=`date` echo "----------Start of Transmission----------" 2>&1 | tee -a $LOGFILE echo "Starting transfer at $now" 2>&1 | tee -a $LOGFILE rsync -av -e ssh $STL_DIR [email protected]:/users/path/folder 2>&1 | tee -a $LOGFILE echo "----------End of transmission----------" 2>&1 | tee -a $LOGFILE printf "\n" 2>&1 | tee -a $LOGFILE I want to be clear that I'm not 100% certain this is related to the empty logs folder. So if anyone could give me a pointer as to what could be going on about the reason why my log folder is empty, that'd be great.

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  • bash disable line wrap without truncation

    - by Eric Huang
    I am using a template heavy library in c++ and need to understand the template errors. Reading line wrapped template errors is a serious pain. Is there a way to disable line wrapping in bash without also truncating the output. Additionally, is there a way to do horizontal scrolling on the output. I have seen this answer, how to make bash not to wrap output?, but the output is truncated. The solution doesn't have to be bash targeted, if there is method for this using another shell, tmux, piping make output to another program, compiling from within vim, etc, I'll use it. (Except for copy-pasting into gedit)

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  • how to souce a csh script in bash to set the enviroment

    - by Daniel
    We have oracle running on Solaris, and the shell is by default CSH. So the login script set the oracle_home,oracle_sid in csh also. But I don't like csh and want to use bash to do my work. So how to source the csh login script in bash? e.g, the following is what in the .cshrc file. And when use bash, I'd like use these variables. One way is to copy the variables again and use bash command, such as export ORACLE_SID=TEST. But doing so will let us to maintain two copy of the files. And when we change the database name, or upgrade the database, I need to maintian the bash login file seperately. It's nice to just use something like source .cshr in bash, but it doesn't work. setenv ORACLE_SID TEST setenv ORACLE_HOME /oracle/TEST/home/products/10204 setenv EPC_DISABLED TRUE setenv MANPATH /usr/local/man:/usr/share/man setenv EDITOR vi setenv LD_LIBRARY_PATH $ORACLE_HOME/lib:/usr/sfw/lib/64 setenv NLS_LANG AMERICAN_AMERICA.UTF8 setenv NLS_DATE_FORMAT "DD-MON-RR"

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  • Getting more helpful tab completion prompts in bash?

    - by Rory McCann
    Let's say I have a directory with a few files in it like this: $ ls file1 file2 file3 And I want to do some tab completion in bash: $ cat file<tab> file1 file2 file3 I remember seeing someone doing tab completion and the shell bolded the next parts, so in this case, it would bold the 1, 2 and 3 of the filename so it'll look like this: file**1** file**2** file**3** which will tell you what you should type in next. I think this was a feature of zsh, but is there any way to get it in bash?

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  • bash vs sh | What is the difference

    - by Saif Bechan
    In using i see 2 types of code #!/usr/bin/sh and #!/user/bin/bash I have Googled this and the opinions vary a lot. The explanation I have seen on most websites is that sh is older than bash, and that there is no real difference. Does someone know the difference between these and can give a practical example when to use either one of them. I highly doubt that there is no real difference, because then having to things that do the exact same thing would be just

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  • Bash Script To Repair Directory and File Ownership

    - by ServerChecker
    My client had me deploy some folders out to a bunch of home directories for his customer websites. I did this with a Bash script, but it ended up using the root account permissions. How do I make a Bash script that takes each folder under /home/user (not hidden files or folders), gets the user and group ownership of that folder, and then does a chown -R {user}.{group} /home/user? The servers are running CentOS Linux.

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  • Launching an application from Bash

    - by JBoy
    I'm right now busy with moving the first steps into Linux, i'm using a bash shell within a mac osx I see in all tutorials that in order to launch an application from the bash its necessary to cd to its directory and simply type the name of the app. This is exatly what i'm doing and it does not work (i have on my desktop a 'Eclipse' folder with the launcher icon in it): cd Desktop cd Eclipse Eclipse.app Why will this not work? I read everywhere that typing the name of the app its enough

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  • How to load powershell profile from cygwin bash?

    - by Jon Erickson
    So in cygwin bash I am able to type "powershell" to bring me into a powershell prompt but it won't load my powershell profile.ps1 due to not being able to execute scripts, but I can't set the execution policy in this prompt... So I tried running the default powershell prompt (as administrator) and was able to set the execution policy to remote signed, but it doesn't affect the powershell within bash what am I missing?

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  • Bash if statement equal output from last command

    - by mYzk
    I am trying to equal something from last command with bash if statement: #!/bin/bash monit status if [ "status" != "error" ]; then echo -e "hostname\ttest\t0\t0" | /usr/sbin/send_nsca -H hostname -c /etc/send_nsca.cfg exit 1; fi Even if the monit status gives out status = online with all services it runs the echo command. I can not figure out how to make the if statement match the status of monit status output.

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  • How can I invoke a function in bash shell script

    - by sufery
    !/bin/bash one_func(){ echo 'abcd' } echo $(one_func) echo one_func the end I just wonder the distinction calling the function between $(one_function) and one_function in bash shell script. When I set the variable "PS1" in ~/.bashrc, I can't invoke the function by one_func e: export PS1="\n[\e[31m]\$(one_func)" it work export PS1="\n[\e[31m]one_func" it doesn't work

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  • Bash command to focus a specific window.

    - by D Connors
    Is there a way, in bash command line, to give focus to a specific window of a running process. Assume I know the process' name, number, and anything else I need. For instance, if I have a single instance of Firefox running, but it's minimized (or there's some other window on top of it). I need a bash command that brings up and gives focus to the Firefox window, by making it the active window. Thanks

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  • (Ubuntu) setuid bash doesn't work

    - by ???
    Here is the code: (root:) # mkdir /test # cp /bin/bash /test/sbash # chmod a+s /test/sbash (user1:) $ cd /test $ ./sbash $ mkdir trycreate mkdir: cannot create directory `trycreate': Permission denied And bash scripts with setuid bit set not work, either. By the way, my setuid perl script works: test.pl: (with setuid bit set, owner=root) #!/usr/bin/perl mkdir('/test/tryperlcreate') or die 'failed'; execute test.pl by user1 will create the directory owned by root.

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  • echo newline character not working in bash

    - by Bashuser
    I have bash script which has lots of echo statements and also I aliased echo to echo -e both in .bash_profile and .bashrc, so that new lines are printed properly for a statement like echo 'Hello\nWorld' the output should be Hello World but the output I am getting is Hello\nWorld I even tried using shopt -s expand_aliases in the script, it doesn't help I am running my script as bash /scripts/scriptnm.sh; if I run it as . /scripts/scriptnm.sh I am getting the desired output...

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  • Error running bash script - No matching processes

    - by Bashity
    I am trying to kill Xcode by running killall Xcode.app, which works normally when I run it through terminal. However, if I put it into a bash script that I keep on my Desktop called re_xcode, the script will output the following error. Please can you tell me where I am going wrong? No matching processes belonging to you were found The file /Users/Max/Desktop/Applications/Xcode.app does not exist. #!/bin/bash killall Xcode.app open ./Applications/Xcode.app

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  • What is the difference between bash and sh

    - by Saif Bechan
    In using i see 2 types of code #!/usr/bin/sh and #!/user/bin/bash I have Googled this and the opinions vary a lot. The explanation I have seen on most websites is that sh is older than bash, and that there is no real difference. Does someone know the difference between these and can give a practical example when to use either one of them. I highly doubt that there is no real difference, because then having to things that do the exact same thing would be just

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  • Comments in a multi-line bash command

    - by Nicolas Raoul
    This single-command BASH script file is difficult to understand, so I want to write a comment for each of the actions: grep -R "%" values* \ | sed -e "s/%/\n%/" \ | grep "%" \ | grep -v " % " \ | grep -v " %<" \ | grep -v "%s" \ | grep -v "%d" \ | grep -v "%1$s" I would hate having to duplicate lines, or having each comment far away from the line it applies to. But at the same time BASH does not seem to allow "in-line" comments. Any elegant way to solve this problem?

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  • Problem with bash scripting

    - by eple
    Hi. I terrible with bash scripting, and need some help with the following: #!/bin/bash if [ -e Pretty* ];then ncftpput -R -DD -v -u xbmc -p xbmc 192.168.1.100 /home/xbmc/TV/Pretty_Little_Liars/ Pretty* else echo "No new folders" fi find -depth -type d -empty -exec rmdir {} \; Problem here is the ncftpput line.. if I just do a simple [ echo "working" ] instead, everything is OK, but when I try the ncftpput-line it just gives me [ line 5: [: too many arguments ] the ncftpput command alone works fine.. Any ideas?

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