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moreutils
“a growing collection of the unix tools that nobody thought to write thirty years ago”
errno - look up errno names and descriptions
ifdata - get network interface info without parsing ifconfig output
ifne - Run command if the standard input is not empty
isutf8 - check whether files are valid UTF-8
lckdo - run a program with a lock held (see also
flock)
mispipe - pipe two commands, returning the exit status of the first