Commands
cat
[OPTION] [FILE]…
Copies the specified file (or standard input) to standard output.
Example: To display the contents of the file /etc/passwd to standard output, use
cat /etc/passwd
 | To send the contents of a file to some other program as input, cat is frequently used on the left side of a pipe: |
cat database.dat | sort -rn
| -A, --show-all | This option is equivalent to “-vET”. |
| -b, --number-nonblank | Use this option to include line numbers for output (nonblank lines only) and to number all nonblank output lines, starting with 1. |
| -e | This option is equivalent to “-vE”. |
| -E, --show-ends | Use this option to display a “$” after the end of each ... |
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