phranz/fdtype: Portable tool to check the type of the given file descriptor from shell scripts. - Codeberg.org

Description:
fdtype purpose is to check the type of a given file descriptor
from shell scripts in the most portable way possible, it simply uses fstat
to make the check.
Motivations:
On a GNU/Linux system, I needed to check if my script
stdin and stdout where connected to a pipe. AFAIK, I could
check this using readlink /dev/stdin or /dev/stdout
but this is not portable and feels too hackish.
The terminal check 'test -t 0' didn't fit my cases either, so I
reflected upon why there wasn't a program enabling shell
scripts to do such a simple task. I still can't find
an answer, but in meantime I wrote this little tool.
Usage and options:
 fdtype [-c|-d|-l|-p|-f|-s|-v|-h] [<fd>] 
 
 <fd> defaults to 0 
 
 -c test for character device 
 -d test for directory 
 -l test for link 
 -p test for pipe 
 -f test for regular file 
 -s test for socket 
 -v print version 
 -h print help 
 
Examples: 
 > ls | fdtype -p && echo 'pipe detected on stdin'
 > ls | { fdtype -p 1 && echo 'pipe detected on stdout' 1>&2 ; } | echo random text
Installing:
 > git clone https://codeberg.org/phranz/fdtype
 > cd fdtype
 > make
 > sudo make install
License:
 MIT