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How to make shell scripts POSIX compliant in Linux?
By default, it invokes sh, and, if installed, dash, bash, zsh, and ksh, but you can target any set of shells that you have installed by using the SHELLS environment variable. Using the example of the echo -n command on macOS to only target shells sh and bash:
How to make Bash conform to the POSIX standard?
Starting Bash with the –posix command-line option or executing ‘set -o posix’ while Bash is running will cause Bash to conform more closely to the POSIX standard by changing the behavior to match that specified by POSIX in areas where the Bash default differs. Thanks for contributing an answer to Stack Overflow!
Which is better lksh or mksh for POSIX?
Note that it’s strongly recommended to invoke lksh with at least the -o posix option, if not both that and -o sh, to fully enjoy better compatibility to the POSIX standard (which is probably why you use lksh over mksh in the first place) or legacy scripts, respectively. You would call lksh -o posix -o sh instead of the simple lksh.
What happens when you use Exec in shell?
When using exec, however, the command following exec replaces the current shell. This means no subshell is created and the current process is replaced with this new command. Let’s run an experiment to understand it better:
How to make a symbolic link to a relative pathname?
Normally, a relative pathname is what you want, and what ln -s gives you. I think what you want is: As the most common shells expands paths, to create a relative symlink you should quote the “source path”. Also, the -s parameter means –symbolic. ln creates hard links by default.
How to create a relative symlink in Bash?
I think what you want is: As the most common shells expands paths, to create a relative symlink you should quote the “source path”. Also, the -s parameter means –symbolic. ln creates hard links by default. If you are certain there is no chance of your mount points changing you can achieve what you are trying to do in a bash shell like this: