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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(2)							System Calls Manual							 rename(2)

NAME
rename - change the name of a file SYNOPSIS
DESCRIPTION
The system call causes the source file to be renamed to target. If target exists, it is first removed. Both source and target must be of the same type (that is, either directories or nondirectories), and must reside on the same file system. If target can be created or if it existed before the call, guarantees that an instance of target will exist, even if the system crashes in the midst of the operation. If the final component of source is a symbolic link, the symbolic link is renamed, not the file or directory to which the symbolic link points. RETURN VALUE
returns the following values: Successful completion. Failure. Neither file is affected. is set to indicate the error. ERRORS
If fails, is set to one of the following values. [EACCES] A component of either path prefix denies search permission. [EACCES] The requested link requires writing to a directory without write permission. [EBUSY] target or source is an existing directory that is the mount point for a mounted file system. [EDQUOT] User's disk quota block or inode limit has been reached for this file system. [EEXIST] target is a directory and is not empty. [EFAULT] source or target points outside the allocated address space of the process. Reliable detection of this error is implementation dependent. [EINVAL] source is a parent directory of target, or an attempt is made to rename the or directory. [EISDIR] target is a directory, but source is not. [ELOOP] Too many symbolic links were encountered in translating either path name. [ENAMETOOLONG] A component of either path name exceeds bytes while is in effect, or the entire length of either path name exceeds bytes. [ENOENT] A component of the source path does not exist, or a path prefix of target does not exist. [ENOSPC] The destination directory cannot be extended because of a lack of space on the file system containing the directory. [ENOTDIR] A component of either path prefix is not a directory. [ENOTDIR] source is a directory, but target is not. [EPERM] The directory containing source has the sticky bit set, and neither the containing directory nor the source are owned by the effective user ID. [EPERM] The target file exists, the directory containing target has the sticky bit set, and neither the containing directory nor the target are owned by the effective user ID. [EROFS] The requested link requires writing in a directory on a read-only file system. [EXDEV] The paths named by source and target are on different logical devices (file systems). AUTHOR
was developed by the University of California, Berkeley. SEE ALSO
open(2). STANDARDS CONFORMANCE
rename(2)
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