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Top Forums Shell Programming and Scripting How to replace words in file? Post 302928362 by junior-helper on Thursday 11th of December 2014 07:20:40 AM
Old 12-11-2014
s sed command: substitute
Ram regexp
Shyam replacement
g sed pattern flag: global substitution
-i sed command line option: "in place" editing

In other words, substitute every occurrence of Ram with Shyam and also change it in the file.

One problem could be that the mentioned sed command doesn't really ensure to match Ram as a single word, so it will also replace Ram in Ramesh, Rammstein and so on, too.

This awk might be more robust
Code:
awk '{ for (i=1;i<=NF;i++) if ($i == "Ram") { $i = "Shyam" }; print }' file

for (i=1;i<=NF;i++) in every line, parse every field
if ($i == "Ram") { $i = "Shyam" } if a field equals Ram, change that field to Shyam
print after all fields in a line are parsed (and potentially modified), print the whole line

Quote:
share any good link
Sed - An Introduction and Tutorial is pretty Smilie

Hope this helps.

---------- Post updated at 02:20 PM ---------- Previous update was at 02:17 PM ----------

Two are better than one...
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SQL::ReservedWords::DB2(3pm)				User Contributed Perl Documentation			      SQL::ReservedWords::DB2(3pm)

NAME
SQL::ReservedWords::DB2 - Reserved SQL words by DB2 SYNOPSIS
if ( SQL::ReservedWords::DB2->is_reserved( $word ) ) { print "$word is a reserved DB2 word!"; } DESCRIPTION
Determine if words are reserved by DB2. METHODS
is_reserved( $word ) Returns a boolean indicating if $word is reserved by either DB2 5, 6, 7 or 8. is_reserved_by_db2v5( $word ) Returns a boolean indicating if $word is reserved by DB2 5. is_reserved_by_db2v6( $word ) Returns a boolean indicating if $word is reserved by DB2 6. is_reserved_by_db2v7( $word ) Returns a boolean indicating if $word is reserved by DB2 7. is_reserved_by_db2v8( $word ) Returns a boolean indicating if $word is reserved by DB2 8. reserved_by( $word ) Returns a list with DB2 versions that reserves $word. words Returns a list with all reserved words. EXPORTS
Nothing by default. Following subroutines can be exported: is_reserved is_reserved_by_db2v5 is_reserved_by_db2v6 is_reserved_by_db2v7 is_reserved_by_db2v8 reserved_by words SEE ALSO
SQL::ReservedWords <http://www-306.ibm.com/software/data/db2/udb/> AUTHOR
Christian Hansen "chansen@cpan.org" COPYRIGHT
This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.8.8 2008-03-28 SQL::ReservedWords::DB2(3pm)
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