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Full Discussion: replacing in many files
Top Forums UNIX for Dummies Questions & Answers replacing in many files Post 302582721 by pandeesh on Saturday 17th of December 2011 01:43:19 PM
Old 12-17-2011
replacing in many files

i have 12 files.in all the files the first line will be like:
Code:
H|20111213 09:23:00|267628|617

I need to replace that with current date:
Code:
H|20111217 09:23:00|267628|617

Like this i need to do it for all the files.

One way i can think is inside a loop, use the below code
Code:
a=`sed -n  '1p'|cut -d'|' -f2|cut -c1-8`
b=`date +%Y%m%d`
head -1 file|sed 's/$a/$b/' > file.changed

Is there any other way to achieve this?

Thanks
 

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CUT(1)							      General Commands Manual							    CUT(1)

NAME
cut - select out columns of a file SYNOPSIS
cut [ -b | -c] list [file...] cut -f list [-d delim] [ -s] OPTIONS
-b Cut specified bytes -c Select out specific characters -d Change the column delimiter to delim -f Select out specific fields that are separated by the -i Runs of delimiters count as one -s Suppres lines with no delimiter characters, when used EXAMPLES
cut -f 2 file # Extract field 2 cut -c 1-2,5 file # Extract character columns 1, 2, and 5 cut -c 1-5,7- file # Extract all columns except 6 DESCRIPTION
[file...]" delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched" Cut extracts one or more fields or columns from a file and writes them on standard output. If the -f flag is used, the fields are sepa- rated by a delimiter character, normally a tab, but can be changed using the -d flag. If the -c flag is used, specific columns can be specified. The list can be comma or BLANK separated. The -f and -c flags are mutually exclusive. Note: The POSIX1003.2 standard requires the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g. kanji), since MINIX uses only one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man- ual page. SEE ALSO
sed(1), awk(9). CUT(1)
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