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Top Forums UNIX for Dummies Questions & Answers How to edit a file on a UNIX Server Post 302827743 by Don Cragun on Sunday 30th of June 2013 02:41:41 PM
Old 06-30-2013
Quote:
Originally Posted by vinil
Hi
View/Edit a file in unix is quite easy indeed.You may like the following to use
1 cat <file_name>
2 cat><filename>
3 vi <filename>

Note that 1st option is to VIEW file only.You will not be able to write in this mode.
2nd and 3rd options make you enable to edit a file.
Be cautious when you edit a file using 3rd option as it may need a bit more knowledge about VI editor prior to use.
But there is no harm in using the 2nd option mentioned above
thanks .
Suggesting redirecting output from the cat utility to edit a file is an EXTREMELY dangerous suggestion for a new user. The first thing that the command:
Code:
cat > filename

does is delete everything in the file named filename. The user then has to retype the exact original contents of every line in the original file except for the changes to be made to the single line that you want to change.
This User Gave Thanks to Don Cragun For This Post:
 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat - catenate and print SYNOPSIS
cat [ -u ] [ -n ] [ -s ] [ -v ] file ... DESCRIPTION
Cat reads each file in sequence and displays it on the standard output. Thus cat file displays the file on the standard output, and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no input file is given, or if the argument `-' is encountered, cat reads from the standard input file. Output is buffered in the block size recommended by stat(2) unless the standard output is a terminal, when it is line buffered. The -u option makes the output completely unbuffered. The -n option displays the output lines preceded by lines numbers, numbered sequentially from 1. Specifying the -b option with the -n option omits the line numbers from blank lines. The -s option crushes out multiple adjacent empty lines so that the output is displayed single spaced. The -v option displays non-printing characters so that they are visible. Control characters print like ^X for control-x; the delete char- acter (octal 0177) prints as ^?. Non-ascii characters (with the high bit set) are printed as M- (for meta) followed by the character of the low 7 bits. A -e option may be given with the -v option, which displays a `$' character at the end of each line. Specifying the -t option with the -v option displays tab characters as ^I. SEE ALSO
cp(1), ex(1), more(1), pr(1), tail(1) BUGS
Beware of `cat a b >a' and `cat a b >b', which destroy the input files before reading them. 4th Berkeley Distribution May 5, 1986 CAT(1)
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