cheat:tr # To replace : with a new line:echo$PATH|tr":""\n"echo$PATH|tr-t":"\n# To remove all occurance of "ab":echoaabbcc|tr-d"ab"# ouput: cc# To complement "aa":# ("Complement" means to keep "aa", and replace all others with "x")echoaabbccd|tr-c"aa"x# output: aaxxxxx (no newline)# To complement "ab\n":echoaabbccd|tr-c"ab\n"x#output: aabbxxx (with newline)# To preserve all alpha(-c). ":-[:digit:] etc" will be translated to "\n". sequeeze mode:
echo$PATH|tr-cs"[:alpha:]""\n"# To convert an ordered list to an unordered list:echo"1. /usr/bin\n2. /bin"|tr-cs" /[:alpha:]\n""+" tldr:tr # tr# Translate characters: run replacements based on single characters and character sets.# Replace all occurrences of a character in a file, and print the result:trfind_characterreplace_character<filename# Replace all occurrences of a character from another command's output:echotext|trfind_characterreplace_character# Map each character of the first set to the corresponding character of the second set:tr'abcd''jkmn'<filename# Delete all occurrences of the specified set of characters from the input:tr-d'input_characters'<filename# Compress a series of identical characters to a single character:tr-s'input_characters'<filename# Translate the contents of a file to upper-case:tr"[:lower:]""[:upper:]"<filename# Strip out non-printable characters from a file:tr-cd"[:print:]"<filename$