Concatenate and write files in reverse, copies each FILE (`-'
means standard input), or standard input if none are given, to standard output,
reversing the records (lines by default) in each separately
SYNTAX tac [OPTION]... [FILE]... OPTIONS -b --before The separator is attached to the beginning of the record that it precedes in the file. -r --regex Treat the separator string as a regular expression. Users of `tac' on MS-DOS/MS-Windows should note that, since `tac' reads files in binary mode, each line of a text file might end with a CR/LF pair instead of the Unix-style LF. -s SEPARATOR --separator=SEPARATOR Use SEPARATOR as the record separator, instead of newline.
"Records" are separated by instances of a string (newline by default).
By default, this separator string is attached to the end of the record that
it follows in the file.
"The best is the enemy of the good" - Voltaire
cat - Display the contents of a file
comm - Compare two sorted files line by line
csplit - Split a file into context-determined pieces
paste - Merge lines of files
sort - Sort text files
split - Split a file into fixed-size pieces