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Full Discussion: How can I extract digits at the end of a string in UNIX shell scripting?
Top Forums Shell Programming and Scripting How can I extract digits at the end of a string in UNIX shell scripting? Post 303026242 by RudiC on Thursday 22nd of November 2018 08:11:26 AM
Old 11-22-2018
For your latest request - increment the last number in the file names - , on top of the "parameter expansion" proposed by bakunin, "arithmetic expansion" could help. Its syntax is (( variable / constant / operator ... )), and it can be mixed with other expansions. For the first two of your sample data, this might work:



Code:
#!/bin/bash
while read FN
  do    TMP=${FN%.txt}
        TMP=${TMP##*[A-Za-z_]}
        echo ${FN%_*}_$((++TMP)).${FN#*.}
   done < file.txt
abc_d123_4568.txt
A246_790.txt

As the structure of the other names is different, above simple approach will fail, and it needs to be adapted, but mayhap you have a good starting point from it.
Last edited by RudiC; 11-22-2018 at 09:25 AM..
This User Gave Thanks to RudiC For This Post:
mingch
 

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SHTOOL-FIXPERM.TMP(1)					      GNU Portable Shell Tool					     SHTOOL-FIXPERM.TMP(1)

NAME

       shtool-fixperm - GNU shtool file permission fixing command

SYNOPSIS

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DESCRIPTION

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SEE ALSO

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