/bin/sh is the POSIX shell. For questions where portability is important. If the question is about .sh files, tag it with scripts instead. On Ubuntu the POSIX shell is symlink to /bin/dash, and [dash-shell] is therefore related to [sh] tag, and both may be used when tagging questions.
Questions tagged [sh]
238 questions
425
votes
4 answers
What is the difference between #!/bin/sh and #!/bin/bash?
if I write,
#!/bin/bash
echo "foo"
or
#!/bin/sh
echo "foo"
both yields same. I have seen some scripts starting with #!/bin/sh or #!/bin/bash. Is there any difference between them?
Rahul Virpara
- 11,860
90
votes
3 answers
What is the sh -c command?
I discovered the sh -c command. I found it before I posted here but I can't find any posts from Google that explain it, so I would like to know what it is and what its complete syntax is.
Lan...
- 951
43
votes
2 answers
Command to perform a recursive chmod to make all .sh files within a directory executable?
Trying to perform a recursive chmod on all the .sh files in a directory to make them executable
Arunava
- 573
- 1
- 4
- 10
23
votes
2 answers
What is the difference between grep apple file and grep "apple" file?
What is the difference between grep apple file and grep "apple" file? What does putting the quotation marks do? They both appear to work and do the exact same thing (display same line).
John Stacen
- 425
- 1
- 5
- 9
18
votes
1 answer
What does ${0%/*} in shell scripts do?
Sorry if this is a stupid question, but I searched about it without success.
What does exactly the second line do ?:
#!/bin/sh
cd ${0%/*} || exit 1
I know the first is the shebang, the second tries to change directory but the confusing part is…
user545149
15
votes
5 answers
Am I using bash or sh?
I'm connected to a remote shell and many keys aren't working properly such as arrows and the escape key. This answer Arrow keys, tab-complete not working suggested I might be in the wrong shell, so I referenced How to determine the current shell I'm…
Info5ek
- 261
14
votes
2 answers
Permission denied when running sh file
I am trying to use an sh file to easily start a screen with my minecraft server console. I named this file mc.sh. I have another sh file in the same directory as mc.sh that runs fine.
Here is what is in mc.sh:
screen -S minecraft java -Xms1024M…
Djm228
- 143
14
votes
2 answers
Mistakenly modified `/bin/sh'
I had this script:
spd-say "Hello, don't forget the trash bin."
So it reminded me of what I supposed to do, and I moved it to /usr/local/bin/ and the command trash pronounced the argument,then I set a crontab job, to make it remind me everyday what…
user833907
13
votes
1 answer
sh: 0: Illegal option --
When I try to run the command below in Ubuntu:
sudo -n -u contd sh --login -c ". /home/contd/iib-10.0.0.5/server/bin/mqsiprofile;/home/contd/iib-10.0.0.5/common/jdk/jre/bin/java -cp…
Firoj Badsa
- 141
12
votes
3 answers
How to create a shortcut for sh file?
I used to launch Android Studio by this steps:
Open Android Studio folder.
Open terminal there.
Confirm sh studio.sh command.
Can I lauch Android Studio from the Desktop by the 1 click?
12
votes
6 answers
My Ubuntu server has been infected by a virus kdevtmpfsi
My Ubuntu server has been infected by a virus kdevtmpfsi, I have already done serveral steps to solve this problem, like all of these: https://github.com/docker-library/redis/issues/217.
But it is still coming again and again when docker container…
Fábio Sousa
- 253
11
votes
2 answers
What's the problem with Bashisms?
With "Bashism" I mean shell syntax which is only understood by the bash shell and not other shells.
If you write a script which gets executed only in environments where /bin/bash exists, then I think avoiding Bashism is just useless and wasting…
guettli
- 1,765
11
votes
3 answers
Where is the alias for "ll" defined?
I often find myself using ll which is an alias.
$ type ll
ll is an alias for ls -lh
I always wondered where this was defined as it works both on bash, zsh but not on sh:
# THIS IS SH
$ ll
sh: 1: ll: not found
user791290
10
votes
2 answers
Why doesn't auto complete work in my shell?
I am not so into Linux and I have the following doubts: a client provided me an Ubuntu 18.04.3 LTS virtual machine which I access via SSH. (I am using MobaxTerm as SSH client but it should not be the problem.) The shell used is sh.
The problem is…
AndreaNobili
- 4,839
10
votes
2 answers
How does ~/ work?
In the terminal, one way to reference home is by using ~/. I don't understand how this works, because the output of file ~/ is:
/home/admin/: directory
and just running ~/ results in:
-bash: /home/admin/: Is a directory
so what's converting ~/…
user8292439
- 3,878
- 7
- 32
- 57