$2.(10$ points$)$ Write a BASH shell script that finds a given command on the search path. If the number of command line arguments is incorrect, then print a usage message and exit with exit code $1.$ If found, then display the pathname and exit with exit code $0.$ If not found, then display an error message and exit with exit code $1.$ You may not use the which, find, locate or any similar Linux command. You must use conditional tests. You must use the $\backslash$$PATH environment variable. Hint: use the tr command.

Filename: cmdsearch.sh

Usage: cmdsearch.sh cmd

$3.(10$ points$)$ Using your solution in Question $1$ as an example, write a BASH shell script that takes a regular expression pattern argument and finds all commands on $\backslash$$PATH that match the given pattern. If the number of command line arguments is incorrect, then print a usage message and exit with exit code $1.$ If found, then display the pathname and exit with exit code $0.$ If not found, then display an error message and exit with exit code $1.$ You may not use the which, find, locate or any similar Linux command. You must use conditional tests. You must use the $\backslash$$PATH environment variable. Hint: use $\backslash (=\backslash$sim $\backslash ).$

Filename: cmdfind.sh

Usage: cmdfind.sh pattern