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Shell Programming and Scripting
modifying specific lines a file
Post 302339259 by ciba on Thursday 30th of July 2009 06:42:55 AM
07-30-2009
awk -F, '{x=x+1} {print $1","$2","x","$4}'
This gives output :
first line,,1, second,,2,
1,"wes",3,"ws"
1,"was",4,"qwa"
,,5,
it alters first 2 lines as well...
---------- Post updated at 05:42 AM ---------- Previous update was at 05:38 AM ----------
the first 2 lines got missed out ...
1,"wes","1","ws"
1,"was","2","qwa"
,,"3"
i have tried replacing the 3 column with sed and awk .. its working ...
my problem boils down to
how to copy first 2 lines of a file and only alter the remaining lines 3rd column ? i have to store this modified file in some other file ....
This gives output :
first line,,1, second,,2,
1,"wes",3,"ws"
1,"was",4,"qwa"
,,5,
it alters first 2 lines as well...
---------- Post updated at 05:42 AM ---------- Previous update was at 05:38 AM ----------
Quote:
the first 2 lines got missed out ...
1,"wes","1","ws"
1,"was","2","qwa"
,,"3"
i have tried replacing the 3 column with sed and awk .. its working ...
my problem boils down to
how to copy first 2 lines of a file and only alter the remaining lines 3rd column ? i have to store this modified file in some other file ....
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LEARN ABOUT OSX
column
COLUMN(1) BSD General Commands Manual COLUMN(1) NAME
column -- columnate lists SYNOPSIS
column [-tx] [-c columns] [-s sep] [file ...] DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file operands, or, by default, from the standard input. Empty lines are ignored. The options are as follows: -c Output is formatted for a display columns wide. -s Specify a set of characters to be used to delimit columns for the -t option. -t Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with the characters supplied using the -s option. Useful for pretty-printing displays. -x Fill columns before filling rows. ENVIRONMENT
The COLUMNS, LANG, LC_ALL and LC_CTYPE environment variables affect the execution of column as described in environ(7). EXIT STATUS
The column utility exits 0 on success, and >0 if an error occurs. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; printf "HH:MM/YEAR NAME " ; ls -l | sed 1d) | column -t SEE ALSO
colrm(1), ls(1), paste(1), sort(1) HISTORY
The column command appeared in 4.3BSD-Reno. BUGS
Input lines are limited to LINE_MAX (2048) bytes in length. BSD
July 29, 2004 BSD