I have a text file with following content (3 lines)
filename : output.txt
first line:12/12/2008
second line:12/12/2008
third line:Y
I would like to know how we can replace 'Y' with 'N' in the 3rd line keeping 1st and 2nd lines same as what it was before.
I tried using cat output.txt... (4 Replies)
I am trying to write a shell script that will allow the typing of a value, then using that value to replace data in a text file.
I suspect I need sed.
The format of the file is:
Variable1:Value1
Variable2:Value2
The interaction would be something like:
Shell Prompt: "Please enter the... (9 Replies)
I am currently writing a script to compare a file list created over an FTP connection to a local directory.
I have cleaned the FTP file list up so that I just have a raw list of filenames however due to the directory structure employed (both locally and on the ftp site) I need to prepend each line... (6 Replies)
Hi All,
I have a file as below:
cat myfile
abcdef
NA
rwer
tyujkl
na
I wish to add the text ".txt" at the end of all lines except the lines starting with NA or na.
I know i can add text at the end of line using following command but I am not sure how to valiate the condition. (14 Replies)
Hi! I'm trying to take multiple text files (6), which have text on some lines but not others, and combine them. I'd also like to make the values in one column of some of the files (files 4-6) negative. I'm trying to write a short script (see below) as I have to do this with a large number of... (2 Replies)
Hi,
How to replace only the function calls with a new name and skip the function definition and declarations. consider the following code.
There are 2 functions defined here returnint and returnvoid.
I need to replace returnint with giveint and returnvoid with givevoid only in the function... (1 Reply)
Hi,
How to replace only the function calls with a new name and skip the function definition and declarations. consider the following code.
There are 2 functions defined here returnint and returnvoid.
I need to replace returnint with giveint and returnvoid with givevoid only in the function... (2 Replies)
I have very large perl source code file and I want to replace every occurrence function say foo,The function foo has some arguments and I want to replace 2nd argument,the current argument is hex integer and i want to replace it to equivalent string.Also I want to replace function name foo with... (4 Replies)
so...
Lets assume I have a text file.
The text file contains multiple "#" symbols.
I want to replace all thos "#"s with a STRING using DOS/Batch
I want to add a certain TEXT to the end of each line.
How can I do this WITHOUT aid of sed, grep or anything linux related ? (1 Reply)
Hello
I am trying to conditionally replace field content in $2 of input file if pattern is found in $4 of the same tab-separated input file. Currently, $2 is empty. I am trying (with no success):
awk -F "\t" 'BEGIN {FS="\t"}{ if ($4=="NO") $2=$2"NO"; print $0}' in > out (2 Replies)
Discussion started by: dovah
2 Replies
LEARN ABOUT V7
diff
DIFF(1) General Commands Manual DIFF(1)NAME
diff - differential file comparator
SYNOPSIS
diff [ -efbh ] file1 file2
DESCRIPTION
Diff tells what lines must be changed in two files to bring them into agreement. If file1 (file2) is `-', the standard input is used. If
file1 (file2) is a directory, then a file in that directory whose file-name is the same as the file-name of file2 (file1) is used. The
normal output contains lines of these forms:
n1 a n3,n4
n1,n2 d n3
n1,n2 c n3,n4
These lines resemble ed commands to convert file1 into file2. The numbers after the letters pertain to file2. In fact, by exchanging `a'
for `d' and reading backward one may ascertain equally how to convert file2 into file1. As in ed, identical pairs where n1 = n2 or n3 = n4
are abbreviated as a single number.
Following each of these lines come all the lines that are affected in the first file flagged by `<', then all the lines that are affected
in the second file flagged by `>'.
The -b option causes trailing blanks (spaces and tabs) to be ignored and other strings of blanks to compare equal.
The -e option produces a script of a, c and d commands for the editor ed, which will recreate file2 from file1. The -f option produces a
similar script, not useful with ed, in the opposite order. In connection with -e, the following shell program may help maintain multiple
versions of a file. Only an ancestral file ($1) and a chain of version-to-version ed scripts ($2,$3,...) made by diff need be on hand. A
`latest version' appears on the standard output.
(shift; cat $*; echo '1,$p') | ed - $1
Except in rare circumstances, diff finds a smallest sufficient set of file differences.
Option -h does a fast, half-hearted job. It works only when changed stretches are short and well separated, but does work on files of
unlimited length. Options -e and -f are unavailable with -h.
FILES
/tmp/d?????
/usr/lib/diffh for -h
SEE ALSO cmp(1), comm(1), ed(1)DIAGNOSTICS
Exit status is 0 for no differences, 1 for some, 2 for trouble.
BUGS
Editing scripts produced under the -e or -f option are naive about creating lines consisting of a single `.'.
DIFF(1)