Did You Know? man is the Linux’s manual pager. Each page argument given to man is normally the name of a program, utility or function. The manual page associated with each of these arguments is then found and displayed. A section, if provided, will direct man to look only in that section of the manual. The default action is to search in all of the available sections, following a pre-defined order and to show only the first page found, even if page exists in several sections.

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cat

Article Index
1. Name
2. Synopsis
3. Frequently used options
4. Examples

1. Name

cat [man page] - concatenate files and print on the standard output

2. Synopsis

cat [OPTION] [FILE]...

3. Frequently used options

-n, --number        number all output lines

4. Examples

cat read content of a file(s) and print then on standard output which is in many cases our terminal. Lets suppose that our file samba.txt contain text:

Samba file and printer sharing is supported by all Linux Distributions: Suse Linux, Debian Linux,
Mandrake Linux, Red Hat Linux, Fedora Linux, Gentoo Linux

When we cat file cat.txt cat will read content of a file a spit it out to stdout:

cat samba.txt

As a description of this command suggest we can also concatenate two files. Our second file ubuntu.txt contain:

and Ubuntu Linux.

Lets see what happens when we cat both files at once:

$ cat samba.txt ubuntu.txt

Now we can use cat to concatenate two files and create new file samba_support.txt.

$ cat samba.txt ubuntu.txt > samba_support.txt

With use of pipe we can redirect output of cat command to another command such us bc:

$ echo '2+2' > '2+2.txt' $ cat 2+2.txt | bc

by -n option we also tell cat to number lines:

$ cat -n samba_support.txt