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Editing files in shell programing
07-13-2005
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cat(1) General Commands Manual cat(1) Name cat - concatenate and print data Syntax cat [ -b ] [ -e ] [ -n ] [ -s ] [ -t ] [ -u ] [ -v ] file... Description The command reads each file in sequence and displays it on the standard output. Therefore, to display the file on the standard output you type: cat file To concatenate two files and place the result on the third you type: cat file1 file2 > file3 To concatenate two files and append them to a third you type: cat file1 file2 >> file3 If no input file is given, or if a minus sign (-) is encountered as an argument, reads from the standard input file. Output is buffered in 1024-byte blocks unless the standard output is a terminal, in which case it is line buffered. The utility supports the processing of 8-bit characters. Options -b Ignores blank lines and precedes each output line with its line number. -e Displays a dollar sign ($) at the end of each output line. -n Precedes all output lines (including blank lines) with line numbers. -s Squeezes adjacent blank lines from output and single spaces output. -t Displays non-printing characters (including tabs) in output. In addition to those representations used with the -v option, all tab characters are displayed as ^I. -u Unbuffers output. -v Displays non-printing characters (excluding tabs and newline) as the ^x. If the character is in the range octal 0177 to octal 0241, it is displayed as M-x. The delete character (octal 0177) displays as ^?. For example, is displayed as ^X. See Also cp(1), ex(1), more(1), pr(1), tail(1) cat(1)