Concatenate and print (display) the content of files.
Syntax cat [Options] [File]... Concatenate FILE(s), or standard input, to standard output. -A, --show-all equivalent to -vET -b, --number-nonblank number nonblank output lines -e equivalent to -vE -E, --show-ends display $ at end of each line -n, --number number all output lines -s, --squeeze-blank never more than one single blank line -t equivalent to -vT -T, --show-tabs display TAB characters as ^I -u (ignored) -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input.
The cat command can be piped into grep to find specific words in the file:
cat file.txt | grep keyword output.txt
However all modern versions of grep have this built-in (so the command will run as a single process) this a much more efficient method:
grep keyword file.txt output.txt
Display a file:
$ cat myfile.txt
Concatenate two files:
$ cat File1.txt File2.txt > union.txt
If you need to combine two files but also eliminate duplicates, this can be done with sort unique:
$ sort -u File1.txt File2.txt > unique_union.txt
Put the contents of a file into a variable
$ my_variable=`cat File3.txt`
"To be nobody but yourself - in a world which is doing its best, night and day, to make you like everybody else - means to fight the hardest battle which any human being can fight, and never stop fighting" ~ E. E. Cummings
cp - Copy one or more files to another location.
mv - Move or rename files or directories.
pv - Monitor the progress of data through a pipe.
tac - Concatenate and write files in reverse.
hexdump - View binary file
Stupid Cat tricks - by Mike Chirico.
Equivalent Windows command: TYPE - Display the contents of a text file.