cat - concatenate and print files
cat [-n] [-u] [-s] [-v [-t] [-e]] file . . .
cat reads each file in sequence and writes it on the standard output.
prints the contents of file on your terminal, and
cat file1 file2 >file3
concatenates file1 and file2, and writes the results in file3. If no
input file is given, or if the argument - is encountered, cat reads from
the standard input. cat processes supplementary code set characters
according to the locale specified in the LC_CTYPE environment variable
(see LANG on environ(5)).
The following options apply to cat:
-n Prepend each line with its line number.
-u The output is not buffered. (The default is buffered output.)
-s cat is silent about non-existent files.
-v Causes non-printing characters (with the exception of tabs, newlines,
and form-feeds) to be printed visibly. ASCII control
characters (octal 000 - 037) are printed as ^n, where n is the
corresponding ASCII character in the range octal 100 - 137 (@, A, B,
C, . . ., X, Y, Z, [, \, ], ^, and _); the DEL character (octal
0177) is printed ^?. Other non-printable characters are printed as
M-x, where x is the ASCII character specified by the low-order seven
bits. All supplementary code set characters are considered to be
The following options may be used with the -v option:
-t Causes tabs to be printed as ^I's and formfeeds to be printed as
-e Causes a $ character to be printed at the end of each line (prior to
The -t and -e options are ignored if the -v option is not specified.
language-specific message file (See LANG on environ (5)).
cp(1), pg(1), pr(1).
Redirecting the output of cat onto one of the files being read will cause
the loss of the data originally in the file being read. For example,
cat file1 file2 >file1
causes the original data in file1 to be lost.
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