Linux Commands: Concatenate and write files in reverse


tac-Linux Command

tac

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 [options]... [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.

Related Linux Bash commands:

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


Other Linux Commands:
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