tldr/pages/linux/cat.md

cat

Print and concatenate files. More information: https://www.gnu.org/software/coreutils/cat.

• Print the contents of a file to stdout:

cat {{path/to/file}}

• Concatenate several files into an output file:

cat {{path/to/file1 path/to/file2 ...}} > {{path/to/output_file}}

• Append several files to an output file:

cat {{path/to/file1 path/to/file2 ...}} >> {{path/to/output_file}}

• Copy the contents of a file into an output file in [u]nbuffered mode:

cat -u {{/dev/tty12}} > {{/dev/tty13}}

• Write stdin to a file:

cat - > {{path/to/file}}

• [n]umber all output lines:

cat -n {{path/to/file}}

• Display non-printable and whitespace characters (with M- prefix if non-ASCII):

cat -v -t -e {{path/to/file}}