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Top Forums UNIX for Dummies Questions & Answers Renaming files in one file from names in other Post 302504092 by pawannoel on Sunday 13th of March 2011 03:02:46 PM
Old 03-13-2011
Hi there,

I tried your code but its giving me the following output:

Code:
:~ noel$ paste b.txt a.txt | while read a b
> do
> t=${b##*_}
> v=$(echo $b | sed 's/.*_//;s/-/+/')
> n=${b%$t}$(( ($v) / 2 )).${a#*.}
> mv "$a $n"
> done 
usage: mv [-f | -i | -n] [-v] source target
       mv [-f | -i | -n] [-v] source ... directory
usage: mv [-f | -i | -n] [-v] source target
       mv [-f | -i | -n] [-v] source ... directory
usage: mv [-f | -i | -n] [-v] source target
       mv [-f | -i | -n] [-v] source ... directory
-bash: () / 2 : syntax error: operand expected (error token is ") / 2 ")

but when I remove the "" in the mv command I get

Code:
> mv $a $n> done
mv: rename U_P_321_9_3_11.ab1 to K2_34650.ab1: No such file or directory
mv: rename U_P_322_9_3_11.ab1 to K7_988973.ab1: No such file or directory
mv: rename U_P_323_9_3_11.ab1 to K12_4253992.ab1: No such file or directory
-bash: () / 2 : syntax error: operand expected (error token is ") / 2 ")

Is this because a.txt and b.txt in this case are files containing entries and not real .ab1 files ??

I will do this will real files soons and let you know but if you can comment on the code to simplfy what its doing its will be a big help. At the moment I dont understand it

Thanks and have a nice evening. Smilie
 

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RENAME(1)							   User Commands							 RENAME(1)

NAME
rename - rename files SYNOPSIS
rename [options] expression replacement file... DESCRIPTION
rename will rename the specified files by replacing the first occurrence of expression in their name by replacement. OPTIONS
-v, --verbose Give visual feedback which files where renamed, if any. -V, --version Display version information and exit. -s, --symlink Peform rename on symlink target -h, --help Display help text and exit. EXAMPLES
Given the files foo1, ..., foo9, foo10, ..., foo278, the commands rename foo foo0 foo? rename foo foo0 foo?? will turn them into foo001, ..., foo009, foo010, ..., foo278. And rename .htm .html *.htm will fix the extension of your html files. WARNING
The renaming has no safeguards. If the user has permission to rewrite file names, the command will perform the action without any ques- tions. For example, the result can be quite drastic when the command is run as root in the /lib directory. Always make a backup before running the command, unless you truly know what you are doing. SEE ALSO
mmv(1), mv(1) AVAILABILITY
The rename command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux June 2011 RENAME(1)
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