Hi,
I have a file which has a date extension to it.
Like <filename>_01012014.
I need to rename the file as 12152013 , that is i need to be able to subtract 15 days from the date of the file name.
Please advise how this can be handled using shell scripting.
Regards,
VN
$ cat tester
#!/bin/bash
file="filename_01012014"
touch $file
cp $file "${file%%_*}_"$(date -d"$(sed -r 's/(.{2})(.{2})(.{4})/\3\2\1/' <<<"${file##*_}") -15 days " +"%d%m%Y")
$ bash tester
$ ls filename_* -1
filename_01012014
filename_17122013
if happy replace cp with mv
for multiple files try this
#!/bin/bash
for file in filename_*; do
cp $file "${file%%_*}_"$(date -d"$(sed -r 's/(.{2})(.{2})(.{4})/\3\2\1/' <<<"${file##*_}") -15 days " +"%d%m%Y")
done
Tested with
GNU sed version 4.2.1
date (GNU coreutils) 8.13
GNU bash, version 4.2.25(1)-release (i686-pc-linux-gnu)
I'm using korn shell.
sh tester
tester: syntax error at line 4: `(' unexpected
Please advise
use ksh <scrptname>
Thanks for your inputs.
ksh tester
tester[4]: syntax error at line 1 : `<' unexpected
I still get an error
The problem appears to be GNU date. That is generally available on Linux servers, not other kinds of UNIX. What UNIX are you running the script on?
Oracle Solaris and am using korn shell