command: which
purpose: locate a command which returns the path names of the files
which would be executed in the current environment
syntax: which [-a] filename
-a print all matching pathnames of each argument
example:
1. To locate command names of gcc ls gdb grep vlc
$ which gcc ls gdb grep vlc
2. To displays all paths of executable matching to argument.
$ which -a echo
regards,
dhanasekar
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