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Questions tagged [sh]

sh stands for a shell. It is also often used as extension for a shell script.

210 questions
439
votes
5 answers

How can I resume a stopped job in Linux?

How can I resume a stopped job in Linux? I was using emacs and accidentally hit ctrl-z which blasted me back to the console. I can see it when I type 'jobs' [*****]$ jobs [1]+ Stopped emacs test_queue.cpp
Bobby
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1 answer

Is redirection with `>>` equivalent to `>` when target file doesn't yet exist?

Consider a shell like Bash or sh. The basic difference between > and >> manifests itself in a case when the target file exists: > truncates the file to zero size, then writes; >> doesn't truncate, it writes (appends) to the end of the file. If the…
Kamil Maciorowski
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60
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8 answers

How to display current path in command prompt in linux's sh (not bash)?

I would like to display current path in sh prompt (not bash shell), which currently just shows "#", I tried with introducing this env PS1="$(whoami)@$(hostname):$(pwd)" and set PS1="$(whoami)@$(hostname):$(pwd)" in /etc/profile. But as obvious…
Bleamer
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50
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2 answers

What exactly is the sh command?

I can't figure out what the sh command is? http://unixhelp.ed.ac.uk/CGI/man-cgi?sh Does it execute a file? like in tomcat: sh /usr/local/tomcat/bin/shutdown.sh Sorry, just confused.
user3183
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47
votes
6 answers

How do I start in bash when ssh'ing into my server?

I have a hosted Debian server. When I log in via ssh, I'm greeted with a sh environment. How do I change it so I start in a bash environment?
bbbgscott
45
votes
4 answers

Which command in the Linux/UNIX sh shell returns my current directory?

Using the sh shell (not bash), which command in Linux/UNIX prints out my current directory? $ *showmewhereiam* /sys/kernel/debug $
Hieu Nguyen
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44
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3 answers

Comments in a multi-line bash command

This single-command BASH script file is difficult to understand, so I want to write a comment for each of the actions: echo 'foo' \ | sed 's/d/a/' \ | sed 's/e/b/' \ | sed 's/f/c/' \ > myfile (sed is just an example, actually it is a mix of…
Nicolas Raoul
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37
votes
2 answers

What is wrong with “echo $(stuff)” or “echo `stuff`”?

I used one of the following echo $(stuff) echo `stuff` (where stuff is e.g. pwd or date or something more complicated). Then I was told this syntax is wrong, bad practice, non-elegant, excessive, redundant, overly complicated, cargo cult…
Kamil Maciorowski
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32
votes
4 answers

What does % do in Linux shell strings?

In Linux shell, what does % do, as in: for file in *.png.jpg; do mv "$file" "${file%.png.jpg}.jpg" done
Nissim Nanach
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24
votes
3 answers

How is install -c different from cp

What is the difference between install -c and cp? Most installations tend to use install -c, but from the man page it doesn't sound like it does anything different than cp (except maybe the ability to also set permissions). When should I use install…
sligocki
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22
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5 answers

/bin/sh source from stdin (from other program) not file

Kind of a tricky one to name this... Basically I have a program which when run prints on STDOUT a set of shell variables: $ ./settings SETTING_ONE="this is setting one" SETTING_TWO="This is the second setting" ANOTHER_SETTING="This is another…
Majenko
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20
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2 answers

Is there a way to "source" a sh script from the fish shell?

I like to put many of my environment variable definitions in the .profile script. If I am using a POSIX-compatible interactive shell like bash, I can use the source command to re-export the environment variables from .profile when it gets updated,…
hugomg
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20
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9 answers

How to find length of string in shell

I need to calculate the length of a string using pure sh shell only. What is happening is that /bin/sh is actually a soft link to bash or another shell. Hence ${#STRING} gives the length of string as it is advance bash feature. Can someone tell me…
Niraj Nandane
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17
votes
4 answers

Change the sudo su shell

Whenever I run sudo su from my normal zsh (which uses the oh-my-zsh framework), I'm forced to use the old Bourne shell (sh) by default (obviously; this is standard behaviour on most *nix-like systems). If I run zsh from within sh after running sudo…
Jules
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16
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1 answer

Redirect stdout/stderr of a background job from console to a log file?

I just run a job (assume foo.sh). ./foo.sh [Press Ctrl-Z to stop] bg # enter background And it generate output to stdout and stderr. Is there any method to redirect to stdout and stderr to other file instead of current screen?
Daniel YC Lin
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