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Should I use bin sh or bin bash?
On different systems, /bin/sh might be a link to ash, bash, dash, ksh, zsh, etc. It will always be sh-compatible though, never csh or fish. As long as you stick to sh features only, you can (and probably even should) use #!/bin/sh and the script should work fine, no matter which shell it is.
Is bin sh same as bash?
bash and sh are two different shells. Basically bash is sh , with more features and better syntax. Most commands work the same, but they are different. In Ubuntu /bin/sh used to link to bash , typical behavior on Linux distributions, but now has changed to linking to another shell called dash.
What is the difference between bin bash and bash?
The –noprofile option may be used when the shell is started to inhibit this behavior. When a login shell exits, bash reads and executes commands from the file ~/. bash_logout , if it exists. bash and /bin/bash are the same, they just were invoked differently (the former was not invoked using the full path).
What is bin bash and bin sh?
@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 ’12 at 3:10.
Is sh always in bin?
No, it is not required for sh to be in /bin . It explicitly cites /bin , /usr/bin , and /usr/xpg4/bin as possible locations. The POSIX spec only requires that sh be in the PATH.
What is the bin sh file?
/bin/sh is an executable representing the system shell and usually implemented as a symbolic link pointing to the executable for whichever shell is the system shell. The system shell is basically the default shell that the script should use.
What shell is bin sh?
The Bourne shell was the default shell for Version 7 Unix. Unix-like systems continue to have /bin/sh —which will be the Bourne shell, or a symbolic link or hard link to a compatible shell—even when other shells are used by most users.
What is the point of #!/ Bin bash?
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”.
What does bin CSH mean?
When you type in a command at the Unix prompt, you are interacting with the shell. E.g., #!/bin/csh refers to the C-shell, /bin/tcsh the t-shell, /bin/bash the bash shell, etc. You can tell which interactive shell you are using the echo $SHELL. command, or alternatively env | grep -i shell.
What is the bin sh folder?
/bin/sh is an executable file that represents the system shell. In fact, whether the shell is a system shell or an executable, it is usually realized as a symbolic link to the executable. Linux shell is the default shell in system script usage.
What is the use of #!/ Bin sh?
What’s the difference between / bin / bash and # bin / sh?
A script may specify #!/bin/bash on the first line, meaning that the script should always be run with bash, rather than another shell. /bin/sh is an executable representing the system shell . Actually, it is usually implemented as a symbolic link pointing to the executable for whichever shell is the system shell.
What’s the difference between a POSIX shell and Bash?
What is bash bash started as an sh -compatible implementation (although it predates the POSIX standard by a few years), but as time passed it has acquired many extensions. Many of these extensions may change the behavior of valid POSIX shell scripts, so by itself bash is not a valid POSIX shell. Rather, it is a dialect of the POSIX shell language.
Is there a way to run GPIO using PI?
I was trying to run a motor using the Pi. It was working fine before when I was executing using a Python script. Later I installed WiringPi and tried to execute the GPIO using shell script and it worked once. After that nothing was working, neither the python scripts nor the shell scripts.
How did the Bash shell get its name?
It is a spiritual descendent of other shells used throughout Unix history. Its name, bash is an abbreviation of Bourne-Again Shell, an homage to the Bourne shell it was designed to replace, though it also incorporates features from the C Shell and the Korn Shell.