38

I would like to add text to the end of filename but before the extension. Right now I am trying,

for f in *.shp; do echo $f_poly; done

the output is,

Quercus_acutifolia.shp_poly
Quercus_agrifolia.shp_poly
Quercus_corrugata.shp_poly
Quercus_cortesii.shp_poly
Quercus_costaricensis.shp_poly
Quercus_havardii.shp_poly
Quercus_hemisphaerica.shp_poly
Quercus_kelloggii.shp_poly
Quercus_knoblochii.shp_poly
Quercus_laceyi.shp_poly

I want it to be,

Quercus_acutifolia_poly.shp
Quercus_agrifolia_poly.shp
Quercus_corrugata_poly.shp
Quercus_cortesii_poly.shp
Quercus_costaricensis_poly.shp
Quercus_havardii_poly.shp
Quercus_hemisphaerica_poly.shp
Quercus_kelloggii_poly.shp
Quercus_knoblochii_poly.shp
Quercus_laceyi_poly.shp

6 Answers 6

39

Using standard POSIX parameter expansion:

for f in *.shp; do printf '%s\n' "${f%.shp}_poly.shp"; done
6
  • Awesome that is exactly what I needed.
    – Sam007
    Nov 26, 2012 at 21:05
  • 1
    Might be better with an explanation how it works. The Doug answer is pretty easy, on the other hand. Jun 23, 2015 at 12:41
  • @SargeBorsch What do you need explained? My answer, the snippet in the question, and Doug's answer are only differ by a few characters, and Doug's answer explains even less than mine so I don't know what it is you want. If you just compare the difference in the two outputs in the question it should be trivially easy to figure out what they do. I can explain why my answer is preferable to Doug's. 1. I use printf with a format string instead of the less portable echo. 2. I use parameter expansion which is more efficient than calling an external binary (basename) for such a simple task.
    – jw013
    Jun 23, 2015 at 14:43
  • 1
    Then the command to rename the files would be this: for f in *.shp; do mv $f ${f%.shp}_poly.shp; done
    – Patch92
    Feb 13, 2019 at 12:28
  • 1
    Is printf required here? If not, using it instead of the echo makes the answer more confusing than it needs to be. The little gained in portability (echo is ubiquitious nowadays) is lost in comprehensibility for novices. Nov 27, 2020 at 5:49
8

Sometimes there is a tool called "rename" installed.

rename 's/\.shp$/_poly.shp/' *shp

It might not be portable but it is easy to use.

1
  • 1
    This is the only one that worked for me, great answer! Dec 22, 2017 at 6:57
5

Use this:

for file in *.shp; do echo $(basename $file .shp)_poly.shp; done
3
  • 4
    Using basename is slower and less efficient than letting the shell do the work by itself. This may be noticeable for very large numbers of files.
    – jw013
    Nov 26, 2012 at 21:14
  • 1
    Also, there are missing quotes and --s and it fails for filenames that have newline characters before the .shp. Nov 16, 2016 at 22:57
  • 1
    Thanks for giving an answer I can actually work with for my purpose. This is bash help, not code golf. (reading over this.. I realize it may have sounded like I was being sarcastic. More gripping about the other answers on here than yours. Thanks again)
    – Tim
    Jul 4, 2019 at 15:48
5

As the question is for bash there is no need for external utilities, since you can use bash regexps:

for i in *.shp
do
    mv -v "${i}" "${i%.*}_MYSUFFIX.${i##*.}"
done
2
  • 1
    I like this one the most since it works generically for any file extension. Thanks!
    – Hans
    Sep 2, 2021 at 6:59
  • This is the best answer. Short, precise and compliant. No subshells. Works with any extension (for i in *.{yml,yaml}; do ...). Nitpicking: 1. Use f. i is no numerical index. 2. The question is about echo, not mv.
    – wedi
    Jan 19 at 18:44
3

This worked better for me:

for f in *; do NEW=${f%.webm}_2016.webm; mv ${f} "${NEW}"; done

3
  • Well this looks a lot like the accepted answer except that you probably want for f in *.webm, you forgot to quote the ${f} and you're missing a --. Nov 16, 2016 at 22:45
  • 1
    The accepted answer doesnt work on OSX, it only prints out the new file names, it doesnt actually rename the files Nov 16, 2016 at 22:47
  • 1
    Of course, it shows you how to use shell expansions to get the new file name, in response to the question that is also outputing a file name (with echo), but not the required one. Nov 16, 2016 at 22:54
1

If they are in different locations then run :-

for i in ` find /root/test/ -name "*.shp" ` ;
do
  mv $i ` echo $i | sed 's/.shp$/_poly.shp/g' ` ;
done

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.