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Questions tagged [sh]

65 questions
38
votes
3 answers

#!/bin/sh vs #!/bin/bash for maximum portability

I usually work with Ubuntu LTS servers which from what I understand symlink /bin/sh to /bin/dash. A lot of other distros though symlink /bin/sh to /bin/bash. From that I understand that if a script uses #!/bin/sh on top it may not run the same way…
cherouvim
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16
votes
1 answer

can't type lower cased e in amazon ec2 (Amazon Linux)

After a few days of operation on my new ec2 build, the following happens: I log into SSH, everything is fine, I do my coding I return the next day, and log into SSH I cannot type a lower cased e anymore--I get the error ding when I type it I try to…
Kato
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14
votes
1 answer

How to change default shell in FreeBSD?

The default shell in FreeBSD is sh and I really can't stand it: autocomplete is very limited, and rehash commands kill me. I feel like a one armed and one legged man... How can I change the shell globally to zsh or bash - for root and for all…
holms
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10
votes
4 answers

Shell script from local machine to execute command in remote machine, then continue on the local machine

The problem is this: I want to copy files from a remote machine. I am looking for a way to write a shell script that would connect to the remote machine, get the location of the stored file, once I get the location disconnect from the remote server…
gnsr
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8
votes
3 answers

FreeBSD 8.2, deleted /bin/sh, can't boot

I made a really bad decision on one of my servers. I deleted /bin/sh. I restarted the server and the server won't run because it needs /bin/sh to start the rc scripts. I can't access single user mode either because sh is needed. Is there any easy…
jon
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7
votes
2 answers

How do I enable XRandR in Xvfb or disable it in firefox when running firefox headless?

I am trying to start firefox headless. The following is the beginning of the shell script that starts it: #!/bin/sh Xvfb :99 >/dev/null 2>&1 & XVFB=$! sleep 3 firefox --display=:99 >/dev/null 2>&1 & FIREFOX=$! When this script is run, the…
Utkonos
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5
votes
3 answers

How do I get ssh to run in the background without using -f?

I'm attempting to create an ssh tunnel, spin it off into a background process, and write a pid file which I can later use to kill it. I CAN run ssh with -f, but then I don't have a handle on its PID. However, when I attempt to run the script below…
vezult
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3
votes
1 answer

Linux shell script "No such file or directory"

I have created a shell script to complete 3 simple tasks (zip a directory, rename the final file and delete the source directory). The script source is below: #!/bin/bash if [[ $2 == *"/data/"* ]] then src= $2"/*"; dest= $1".zip"; #…
h2odev
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3
votes
1 answer

AIX update environment after .profile change

I am running AIX 5.3. I have made changes to a user's .profile file (added a couple of environment variables). Is there a command that I can use to re-process the .profile file for a particular user without them having to log out and then back…
Buggabill
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3
votes
3 answers

How can a sh script determine if it was started as a cron job as opposed to interactive or background?

I'd like to use the same scripting for cron and interactive, just wondering if there was a universal way over UNIX/Linux systems to easily make this determination.
mdpc
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3
votes
2 answers

`sh` access denied over ssh connection

I have an ubuntu server and a windows XP client running Cygwin. The server ssh's into the client and tries to execute a shell script with some params, with the following command: ssh user@IP_ADDR 'sh /home/user/project/clientside 2 5 7 6 9 5 7…
inspectorG4dget
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3
votes
3 answers

SH conditional redirection

I want to be able to redirect some output of my script to /dev/null based on a command line switch. I don't know how should I do it. In a silly way, it would be something like this (in a too simplified way): #!/bin/sh REDIRECT= if [ $# -ge 1 -a…
j4x
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3
votes
5 answers

How to execute shell scrips without creating files

How is it possible to execute a shell script without creating a file? For example assume I have the following script (testscript): #!/bin/bash function run_free() { free -m } run_free I then of course can execute this with: sh testscript I want…
Justin
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2
votes
1 answer

In bash script, what is difference between > and >| redirections?

What is the difference between the following two redirection commands? ls > out ls >| out They both seem to produce the same output.
GoodMirek
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2
votes
1 answer

What's the accurate meaning of "exec &>/var/log/a.log" in a shell script?

I think this is some kind of io redirect but it looks different to the examples from manual. Normally, we can redirect stdout of the script by following line: exec 1> /var/log/a.log But I saw this line in one of script: exec &>…
James Gan
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