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• Using SSH, transfer webURL to remote machine

  - by AlanTuring

  Hi so i was doing some research in the library so i could use some pictures later on my Desktop computer in my room. I have space on my Lab account which i usually SSH into, and i was wondering if URL's can be directly transferred over to a remote machine and saved on the hard disk. I was thinking something like this: scp http://click.si.edu/images/truncatedurl.jpg /home3/etc.../filename.jpg is this possible? Thanks in advance.

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• VB script + change word in VB script on text file

  - by yael

  how to change word in text file by VB script (like sed in unix)

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• How to print new line character with echo?

  - by Summer_More_More_Tea

  I dump a string with hexdump like this 2031 3334 2e30 0a32 2032 3331 302e 000a. It is clear that 0x0a is new line character, however, when I try to echo this string out, I always got 1 430.2 2 13.0 -- the new line is replaced with a space, even I use the -e flag. What may be the problem? Does the tailing \0 ruin the output? Is there any alternatives to print 0x0a a new line? Thanks and Best regards.

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• Creating a link to name changing directory

  - by groove1534

  I have an Ubuntu 12.04 installed using wubi + Win7. I'm trying to create a link to "my documents" directory which located in my C drive: C:\Users\Myuser\My Documents\ Since the Ubuntu is installed in D:\, which is the "host", my C drive is accessible via /media/some_changing_hex. This hex get changed each time I restart my machine. So I need, somehow, to create a link that uses regex OR a link that somehow gets the the first (in this case - only) subdirectory in /media (something like all_subdirectories[0]). So how do I do that?

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• How to execute a command whenever a file changes?

  - by Denilson Sá

  I want a quick and simple way to execute a command whenever a file changes. I want something very simple, something I will leave running on a terminal and close it whenever I'm finished working with that file. Currently, I'm using this: while read; do ./myfile.py ; done And then I need to go to that terminal and press Enter, whenever I save that file on my editor. What I want is something like this: while sleep_until_file_has_changed myfile.py ; do ./myfile.py ; done Or any other solution as easy as that. BTW: I'm using Vim, and I know I can add an autocommand to run something on BufWrite, but this is not the kind of solution I want now. Update: I want something simple, discardable if possible. What's more, I want something to run in a terminal because I want to see the program output (I want to see error messages). About the answers: Thanks for all your answers! All of them are very good, and each one takes a very different approach from the others. Since I need to accept only one, I'm accepting the one that I've actually used (it was simple, quick and easy-to-remember), even though I know it is not the most elegant.

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• Custom script in .screenrc

  - by benoror

  Hi. I made a script that spawns a remote shell or runs a local shell whether it's on the current machine or not: #!/bin/bash # By: benoror <[email protected]> # # spawns a remote shell or runs a local shell whether it's on the current machine or not # $1 = hostname if [ "$(hostname)" == "$1" ]; then bash else ssh "$1.local" fi For example, if I'm on server1: ./spawnshell.sh server1 -> runs bash ./spawnshell.sh server2 -> ssh to server2.local I want that script to run automatically in separate tabs in GNU Screen, but I can't make it run, my .screenrc: ... screen -t "@server1" 1 exec /home/benoror/scripts/spawnshell.sh server1 screen -t "@server2" 2 exec /home/benoror/scripts/spawnshell.sh server2 ... But it doesn't works, I've tried without 'exec', with -X option and a lot more. Any ideas ?

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• Pydev and Django: Shell not finding certain modules?

  - by Rosarch

  I am developing a Django project with PyDev in Eclipse. For a while, PyDev's Django Shell worked great. Now, it doesn't: >>> import sys; print('%s %s' % (sys.executable or sys.platform, sys.version)) C:\Python26\python.exe 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)] >>> >>> from django.core import management;import mysite.settings as settings;management.setup_environ(settings) Traceback (most recent call last): File "<console>", line 1, in <module> ImportError: No module named mysite.settings >>> The dev server runs just fine. What could I be doing wrong? The models module is also conspicuously absent: >>> import mysite.myapp.models Traceback (most recent call last): File "<console>", line 1, in <module> ImportError: No module named mysite.myapp.models On the normal command line, outside of PyDev, the shell works fine. Why could this be happening?

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• write to fifo/pipe from shell, with timeout

  - by Tim

  I have a pair of shell programs that talk over a named pipe. The reader creates the pipe when it starts, and removes it when it exits. Sometimes, the writer will attempt to write to the pipe between the time that the reader stops reading and the time that it removes the pipe. reader: while condition; do read data <$PIPE; do_stuff; done writer: echo $data >>$PIPE reader: rm $PIPE when this happens, the writer will hang forever trying to open the pipe for writing. Is there a clean way to give it a timeout, so that it won't stay hung until killed manually? I know I can do #!/bin/sh # timed_write <timeout> <file> <args> # like "echo <args> >> <file>" with a timeout TIMEOUT=$1 shift; FILENAME=$1 shift; PID=$$ (X=0; # don't do "sleep $TIMEOUT", the "kill %1" doesn't kill the sleep while [ "$X" -lt "$TIMEOUT" ]; do sleep 1; X=$(expr $X + 1); done; kill $PID) & echo "$@" >>$FILENAME kill %1 but this is kind of icky. Is there a shell builtin or command to do this more cleanly (without breaking out the C compiler)?

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• Controlling shell command line wildcard expansion in C or C++

  - by Adrian McCarthy

  I'm writing a program, foo, in C++. It's typically invoked on the command line like this: foo *.txt My main() receives the arguments in the normal way. On many systems, argv[1] is literally *.txt, and I have to call system routines to do the wildcard expansion. On Unix systems, however, the shell expands the wildcard before invoking my program, and all of the matching filenames will be in argv. Suppose I wanted to add a switch to foo that causes it to recurse into subdirectories. foo -a *.txt would process all text files in the current directory and all of its subdirectories. I don't see how this is done, since, by the time my program gets a chance to see the -a, then shell has already done the expansion and the user's *.txt input is lost. Yet there are common Unix programs that work this way. How do they do it? In Unix land, how can I control the wildcard expansion? (Recursing through subdirectories is just one example. Ideally, I'm trying to understand the general solution to controlling the wildcard expansion.)

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• Why do I see the weird backspace behaviour on my shell sometimes?

  - by Lazer

  I use bash shell and sometimes all of a sudded, my Backspace key stops working (when this happens Ctrl + Backspace still works fine) I am not sure why this happens, but it also carries over to any vim sessions that I use from the shell. To my surprise, getting a fresh shell does not help, and the problem seems to go away as abruptly as it started. This is what the typed characters look like, each Backspace keypress is shown by a ^? on the shell $ cat filem^?namr^?e Does anybody have a clue what might be happening? How can I restore the normal behaviour?

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• Why won't this script accept any arguments?

  - by Nate Wagar

  I'm trying to write an SVN post-commit hook and, strangely, am getting hung up on what should be the easiest part. The Script: set REPO="$1" set REV="$2" set SVNBIN="/opt/CollabNet_Subversion/bin/" set SSHBIN="/usr/bin/ssh" set HOST="staging.domain.net" set timeout=30 set USERNAME="svn-usr" set E_NO_CONNECT=2 set E_WRONG_PASS=3 set E_UNKOWN=25 set CHANGED=`"$SVNBIN"svnlook changed --revision $REV $REPOS` echo "Here are changes: $CHANGED" >> /var/svn/repos/www/logs/testing echo "Command: $0; Repo: $REPO; Rev: $REV; Total: $#" >> /var/svn/repos/www/logs/testing set PROJECT "" Yet when I call it, it doesn't seem to be seeing the arguments I pass to it: /var/svn/repos/www/logs> sudo ../hooks/post-commit /var/svn/repos/www 33 svnlook: missing argument: --revision Type 'svnlook help' for usage. /var/svn/repos/www/logs> cat testing Here are changes: Command: ../hooks/post-commit; Repo: ; Rev: ; Total: 1 This is on a Solaris 10 SPARC box. I'm a bit of a script newbie, but shouldn't this be really easy??

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• Need a really simple client manage script to deliver graphics and revisions, please help?

  - by Mark R

  I am looking for a very simple client management script. The process flow of the script should be: Client orders (paypal etc) while giving specs on what they need given login details and thanked for their order backend for them consists of a 2 way communication. They ask questions we answer. We also upload the graphics here where they either accept them or as for revision. process complete. Now I cannot for the life of me find something as simple as this. It seems all the scripts out there are way too complicated. Does anyone know of one I can use to do this?

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• Shell script not picking up password file...

  - by BigDogsBarking

  Running the below shell script seems to ignore the password file I'm feeding it. I'm continually prompted for it. If I enter it, the rest of the script goes without a hitch, but as I'm running it via cron, I really need to get it to read from the file... Any suggestions? #!/bin/sh p=$(<password.txt) set -- $p pass_phrase=$1 destination="/var/www/d" cd /var/sl/ for FILE in *.pgp; do FILENAME=${FILE%.pgp} gpg --passphrase "$pass_phrase" --output "$destination/$FILENAME" --decrypt "$FILE" rm -f $FILE done

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• An agenda in Korn Shell: New / Edit / Delete / View appointment

  - by Abaco

  As stated in the title, I have to write a simple script which should perform some typical agenda's functions. The script must use crontab. The functions are: Creating a new appointment Edit an existent appointment Delete an appointment List the appointment I really don't have a clue how to do this, can you help me with some hint? Maybe a bit of sweet code? Thank you very much, Abaco EDIT: To be more specific on my question Point 1: how can I edit a crontab thorugh ksh? How can I insert a new line? Can you link me some documentation or a bit of code about this?

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• Substring extraction using bash shell scripting and awk

  - by rohanbk

  So, I have a file called 'dummy' which contains the string: "There is 100% packet loss at node 1". I also have a small script that I want to use to grab the percentage from this file. The script is below. result=`grep 'packet loss' dummy` | awk '{ first=match($0,"[0-9]+%") last=match($0," packet loss") s=substr($0,first,last-first) print s}' echo $result I want the value of $result to basically be 100% in this case. But for some reason, it just prints out a blank string. Can anyone help me?

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• How to kill all subprocesses of shell?

  - by depesz

  I'm writing bash script, which does several thing. In the beginning it starts several monitor scripts, each of them runs some other tools. At the end of my main script, I would like to kill all things that spawned from my shell. So, it might looks like this: #!/bin/bash some_monitor1.sh & some_monitor2.sh & some_monitor3.sh & do_some_work ... kill_subprocesses The thing is that most of these monitors spawn their own subprocesses, so doing (for example): killall some_monitor1.sh will not always help. Any other way to handle this situation?

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• shell scripting: nested subshell ++

  - by jhon

  Hi guys, more than a problem, this is a request for "another way to do this" actually, if a want to use the result from a previous command I into another one, I use: R1=$("cat somefile | awk '{ print $1 }'" ) myScript -c $R1 -h123 then, a "better way"is: myScript -c $("cat somefile | awk '{ print $1 }'" ) -h123 but, what if I have to use several times the result, let's say: using several times $R1, well the 2 options: option 1 R1=$("cat somefile | awk '{ print $1}'") myScript -c $R1 -h123 -x$R1 option 2 myScript -c $("cat somefile | awk '{ print $1 }'" ) -h123 -x $("cat somefile | awk '{ print $1 }'" ) do you know another way to "store" the result of a previous command/script and use it as a argument into another command/script? thanks

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• How to warn for the use of unset variables in a korn shell script

  - by Lepu

  Is there any way to throw errors or warnings in a korn shell script to prevent the use of unset variables ? Let's assume I have a temporary folder that I want to remove. TEMP_FILES_DIR='/app/myapp/tmp' rm -Rf $TEMP_FILE_DIR #notice the misspelling How to prevent this kind of mistakes before they actually happen? I know the script should check for file existence and empty string before attempting to remove, this is just a silly example to illustrate a mistake that could have been avoided with some warnings. I don't know if this feature exists in ksh. If it does exist, how do you turn it on?

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• How to maipulate the shell output in php

  - by Mirage

  I am trying to write php script which does some shell functions like reporting. So i am starting with diskusage report I want in following format drive path ------------total-size --------free-space Nothing else My script is $output = shell_exec('df -h -T'); echo "<pre>$output</pre>"; and its ouput is like below Filesystem Type Size Used Avail Use% Mounted on /dev/sda6 ext3 92G 6.6G 81G 8% / none devtmpfs 3.9G 216K 3.9G 1% /dev none tmpfs 4.0G 176K 4.0G 1% /dev/shm none tmpfs 4.0G 1.1M 4.0G 1% /var/run none tmpfs 4.0G 0 4.0G 0% /var/lock none tmpfs 4.0G 0 4.0G 0% /lib/init/rw /dev/sdb1 ext3 459G 232G 204G 54% /media/Server /dev/sdb2 fuseblk 466G 254G 212G 55% /media/BACKUPS /dev/sda5 fuseblk 738G 243G 495G 33% /media/virtual_machines How can i convert that ouput into my forn\matted output

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• Shell script variable problem

  - by user280288

  Hi all, I'm trying to write a shell script to automate a job for me. But i'm currently stuck. Here's the problem : I have a variable named var1 (a decreasing number from 25 to 0 and another variable named var${var1} and this equals to some string. then when i try to call var${var1} in anywhere in script via echo it fails. I have tried $[var$var1], ${var$var} and many others but everytime it fails and gives the value of var1 or says operand expected error. Thanks for your help

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• Shell scripting and test expressions

  - by Paul

  Hi, I'm trying to test whether a directory path exists when a file is passed to my script. I use dirname to strip and save the path. I want my script to run only if the path exists. This is my attempt below. FILE=$1 DIRNAME=dirname $FILE if [ -z $DIRNAME ] ; then echo "Error no file path" exit 1 fi But this doesn't work. Actual when there is no file path dirname $FILE still returns "." to DIRNAME, i.e. this directory. So how do i distinguish between "." and "/bla/bla/bla". Thanks.

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• Run three shell script simultaneously

  - by user1419563

  I have three shell script which I am running as below- sh -x script1.sh sh -x script2.sh sh -x script3.sh So each script is executed sequentially one at a time after previous one finished executing. Problem Statement:- Is there any way I can execute all the three above scripts at same time from a single window? I just want to execute script1, script2, script3 at the same time. If you think of some cron JOB scheduling script1 at 3 AM, script2 at 3AM, script3 at 3AM (all three scripts at the same time, simultaneously). That's what I need, I need to execute all the three scripts simultaneously.

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• username and password for rsync in script

  - by sims

  I'm creating a cron job to keep two dirs in sync. I'm using rsync. I'm running an rsync daemon. I read the manual and it says: RSYNC_PASSWORD Setting RSYNC_PASSWORD to the required password allows you to run authenticated rsync connections to an rsync daemon without user intervention. Note that this does not supply a password to a shell transport such as ssh. USER or LOGNAME The USER or LOGNAME environment variables are used to determine the default username sent to an rsync daemon. If neither is set, the username defaults to 'nobody' I have something like: #!/bin/bash USER=name RSYNC_PASSWORD=pass DEST="server::module" /usr/bin/rsync -rltvvv . $DEST I also tried exporting (dangerous, I know) USER and RSYNC_PASSWORD. I also tried with LOGNAME. Nothing works. Am I doing this correctly?

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• script to automatically test if a web site is available

  - by Xoundboy

  I'm a lone web developer with my own Centos VPS hosting a few small web sites for my clients. Today I discovered my httpd service had stopped (for no apparent reason - but that's another thread). I restarted it but now I need to find a way that I can be notified by email and/or SMS if it happens again - I don't like it when my client rings me to tell me their web site doesn't work! I know there are probably many different possibilities, including server monitoring software. I think all I really need is a script that I can run as a cron job from my dev host (which is permanently running in my office) that attempts to load a page from my production server and if it doesn't load within say 30 seconds then it sends me an email or SMS. I'm pretty rubbish at shell scripting, hence this question. Any suggestions would be gratefully appreciated, thanks to all you clever sysadmin guys and girls out there :)

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• busybox shell refuses to execute the particular line of script

  - by neil1234

  Hi, I am using busybox shell to execute a script which the bash executes when i boot linux using the nfs. Please let me know the correct alternative for this line. cur_major=$((0x`stat -c %t $dev 2>/dev/null`)) The busybox throws in an error saying "0x" syntax error, which i understand is the problem with the syntax of this line. Thanks in advance

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