One Day One GNU/Linux Command (TR)
Bharathi Subramanian
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tr - TRanslate or Delete characters
Summary:
tr will translate, squeeze, and/or delete characters from stdin,
writing to stdout. 'tr' supports few standard Esc sequences, regular
expressions, char classes (lower, upper, space, blank, alpha ...),
etc.
Examples:
$ echo "tenet" | tr "tn" "TN" -- Translate t to T & n to N.
$ echo "ilugc" | tr "[a-z]" "[A-Z]" -- Change case (lower to upper)
$ echo "ilugc" | tr '[:lower:]' '[:upper:]' -- Same as above.
$ echo "HelloooOOOoooo" | tr -s '[:lower:]' -- Squeeze the "lower"
case letters.
$ echo "IwLxUyGzC" | tr -d xyz -- Remove xyz
$ cat myfile | tr -s '\n' -- Remove repeated new lines.
$ echo "ABCDEFG" | tr -c "ACEG" "\n" -- Expect "ACEG" translate
others to newline char.
Read : man tr
Bye :)
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Bharathi S