Bash Script : what does #!/bin/bash mean? - Stack Overflow
Dec 14, 2012 · 8. @ShivanRaptor #!/bin/bash Means run this script in bash. #!/bin/sh means run this script in sh which is the default unix shell, which might be bash or any other variant like ksh, dash, zsh, etc. – Karthik T. Dec 14, 2012 at 3:10. When bash is run as sh, it behaves differently (more POSIX-like) than when it is run as bash.
Why do you need to put #!/bin/bash at the beginning of a script …
Jan 23, 2012 · Bash has evolved over the years taking code from ksh and sh. Adding #!/bin/bash as the first line of your script, tells the OS to invoke the specified shell to execute the commands that follow in the script. #! is often referred to as a "hash-bang", "she-bang" or "sha-bang". edited Mar 11, 2015 at 17:47.
How do I execute a bash script in Terminal? - Stack Overflow
A: To "execute this script" from the terminal on a Unix/Linux type system, you have to do three things: 1. Tell the system the location of the script. (pick one) # type the name of the script with the full path. > /path/to/script.sh. # execute the script from the directory it is in. > ./script.sh.
What is the preferred Bash shebang ("#!")? - Stack Overflow
Apr 30, 2012 · Feb 3, 2022 at 18:24. 3. #!/usr/bin/env bash poses a privilege escalation security threat when a suid program executes a bash script that has such a shebang. The user can simply manipulate his PATH and get an arbitrary bash executable to …
linux - What does 'bash -c' do? - Stack Overflow
Jun 3, 2012 · Also be aware that commands called from bash -c will be forced to singlethreading. eg: "bash -c 'ffmpeg -threads 4 -i input.mov output.mp4'" will call ffmpeg but it can only use one core even though you specified the "threads" parameter –
How does /bin/bash -c differ from executing a command directly?
You are using double-quotes, so the parent shell is interpolating backticks and variables before passing the argument to /bin/bash. Thus, your /bin/bash is receiving the following arguments: -c "for f in x y z ... ; do echo ; done;"
linux - What is the difference between "#!/usr/bin/env bash" and ...
7. One major difference is that, depending on the system, #!/usr/bin/bash won't work. On my system (Ubuntu 17.04), bash is /bin/bash, and there is no /usr/bin/bash. The distinction between /bin and /usr/bin is largely arbitrary. And just to add to the frivolity, most systems put the env command in /usr/bin, but that's not guaranteed.
linux - !#/bin/bash: No such file or directory - Stack Overflow
Jan 23, 2017 · I'm hoping Bash is (wanting to be) Unicode compliant? It would be a lot better if we could leave the BOM in imho, as it is actually an excellent mechanism to unambiguously encode the file encoding in the file itself, instead of having to rely on headers/metadata/manual config/guessing...
What's the meaning of the parameter -e for bash shell command …
158. The -e option means "if any pipeline ever ends with a non-zero ('error') exit status, terminate the script immediately". Since grep returns an exit status of 1 when it doesn't find any match, it can cause -e to terminate the script even when there wasn't a real "error". If you want to keep the -e option, but also have a grep command that ...
When must I use #!/bin/bash and when #!/bin/sh? - Super User
Oct 10, 2016 · You should only ever use #! /bin/sh. You should not use bash (or zsh, or fish, or ...) extensions in a shell script, ever. You should only ever write shell scripts that work with any implementation of the shell language (including all the "utility" …