[opensuse] Bash - sed variable help needed - openSUSE Users

[opensuse] Bash - sed variable help needed

David C. Rankin

16 Aug 2008 16 Aug '08

07:14

Listmates, I am trying to translate filenames for our digital camera pictures. The problem being that we have 2 identical Kodak digital cameras and they each store pictures in the filename format 100_1234.jpg To avoid the duplicate filename problems that will occur (100_1235 and from the other 100_1235) I want a quick script to translate the filenames on one camera to something other than 100_xxx. I have a small script that can do that, but instead of just a static change to 101_xxx, I would like to change the 100 into something more useful, like a date. The problem is that I cannot get sed to allow substitution of a value contained in the sed expression. So far, I can do: for i in $(ls); do ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/101zd/') which is fine. What I want to do is something like: for i in $(ls); do ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/') This is where the trouble comes in. I can't see a way to accomplish this. Anybody have any ideas? I guess I could turn the problem around and grab the numerical part on the right side of the _ with sed and then concatenate the date to that. However, if this is a way to work a variable into sed, that would be great. Any ideas? -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

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Jon Clausen

16 Aug 16 Aug

07:18

On Sat, 16 Aug, 2008 at 02:14:03 -0500, David C. Rankin wrote:

...

What I want to do is something like:

for i in $(ls); do

ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/')

This is where the trouble comes in. I can't see a way to accomplish this. Anybody have any ideas? I guess I could turn the problem around and grab the numerical part on the right side of the _ with sed and then concatenate the date to that. However, if this is a way to work a variable into sed, that would be great. Any ideas?

Use double quotes instead; ... | sed -e "s/^100/$(date +%Y%m%d)/" hth /jon -- YMMV -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

David C. Rankin

09:30

Jon Clausen wrote:

...

On Sat, 16 Aug, 2008 at 02:14:03 -0500, David C. Rankin wrote:

...
What I want to do is something like:

for i in $(ls); do

ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/')

This is where the trouble comes in. I can't see a way to accomplish this. Anybody have any ideas? I guess I could turn the problem around and grab the numerical part on the right side of the _ with sed and then concatenate the date to that. However, if this is a way to work a variable into sed, that would be great. Any ideas?

Use double quotes instead;

... | sed -e "s/^100/$(date +%Y%m%d)/"

hth /jon

Excellent! I knew it had to the simple. Thanks jon! -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

Randall R Schulz

13:12

On Saturday 16 August 2008 00:18, Jon Clausen wrote:

...

On Sat, 16 Aug, 2008 at 02:14:03 -0500, David C. Rankin wrote:

...
What I want to do is something like:

for i in $(ls); do

ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/')

This is where the trouble comes in. I can't see a way to accomplish this. Anybody have any ideas? I guess I could turn the problem around and grab the numerical part on the right side of the _ with sed and then concatenate the date to that. However, if this is a way to work a variable into sed, that would be great. Any ideas?

Use double quotes instead;

... | sed -e "s/^100/$(date +%Y%m%d)/"

The difference between single and double quotes in shell scripting is a key distinction to be aware of. Additionally, it's probably worthwhile to put the date-stamp string into a variable and use that in the sed invocation in order to avoid repeatedly invoking the "date" command to get the same string (unless the command runs across midnight, of course). % dateStamp="$(date +%Y%m%d)" ... % ... |sed -e "$s/^100/$dateStamp/"

...

hth /jon -- YMMV

Randall Schulz -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

David C. Rankin

07:31

David C. Rankin wrote:

...

Listmates,

What I want to do is something like:

for i in $(ls); do

ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/')

This is where the trouble comes in. I can't see a way to accomplish this. Anybody have any ideas? I guess I could turn the problem around and grab the numerical part on the right side of the _ with sed and then concatenate the date to that. However, if this is a way to work a variable into sed, that would be great. Any ideas?

I took the easy way out... for i in $(ls); do ORIG_FNAME=$i PICNUM=$(echo $i | sed -e 's/^100//') NEW_FNAME="$TODAY$PICNUM" mv $ORIG_FNAME $NEW_FNAME -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

Theo v. Werkhoven

09:50

Sat, 16 Aug 2008, by drankinatty@suddenlinkmail.com:

...

David C. Rankin wrote:

...
Listmates, What I want to do is something like: for i in $(ls); do ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/') This is where the trouble comes in. I can't see a way to accomplish this. Anybody have any ideas? I guess I could turn the problem around and grab the numerical part on the right side of the _ with sed and then concatenate the date to that. However, if this is a way to work a variable into sed, that would be great. Any ideas?

I took the easy way out...

for i in $(ls); do

ORIG_FNAME=$i PICNUM=$(echo $i | sed -e 's/^100//')

NEW_FNAME="$TODAY$PICNUM" mv $ORIG_FNAME $NEW_FNAME

There is a tool for this you know (not surprisingly, this is Linux..), look at exiftool(1) I think you could use one of these examples from the manpage. exiftool '-FileNamehttp://counter.li.org ICBM 52 13 26N , 4 29 47E. + ICQ: 277217131 SUSE 10.3 + Jabber: muadib@jabber.xs4all.nl Kernel 2.6.22 + See headers for PGP/GPG info. Claimer: any email I receive will become my property. Disclaimers do not apply. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

David C. Rankin

19 Aug 19 Aug

07:09

Theo v. Werkhoven wrote:

...

There is a tool for this you know (not surprisingly, this is Linux..), look at exiftool(1)

I think you could use one of these examples from the manpage.

exiftool '-FileName
exiftool -r '-FileName
exiftool '-FileName<${CreateDate}_$filenumber.jpg' -d %Y%m%d dir/*.jpg Set the filename of all JPG images in the current directory from the CreateDate and FileNumber tags, in the form "20060507_118-1861.jpg".

Theo

Thank you Theo! I think you just saved me about 1000 hours of frustraton! -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

David Bolt

16 Aug 16 Aug

16:06

On Sat, 16 Aug 2008, David C. Rankin wrote:- While you've already had some answers, here's a few other tips.

...

The problem is that I cannot get sed to allow substitution of a value contained in the sed expression. So far, I can do:

...

for i in $(ls); do

ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/') ^ ^ These aren't the same as using double-quotes. Bash won't do expansion or execution within single quoted strings.

Also, there's no need for the "echo | sed" combination. You could use: DATE=$(date +%Y%m%s) for ORIG_FNAME in * do if [ "${ORIG_FNAME::3}" == "100" ] # check first three characters of $ORIG_FNAME then NEW_FNAME=${DATE}${ORIG_FNAME:3} else continue # skip this file fi # if a file with the new name exists, skip it, else rename # [ ! -e "${NEW_FNAME}" ] && mv "${ORIG_FNAME}" "${NEW_FNAME}" Regards, David Bolt -- Team Acorn: http://www.distributed.net/ OGR-P2 @ ~100Mnodes RC5-72 @ ~15Mkeys SUSE 10.1 32 | | openSUSE 10.3 32b | openSUSE 11.0 32b | openSUSE 10.2 64b | openSUSE 10.3 64b | openSUSE 11.0 64b RISC OS 3.6 | TOS 4.02 | openSUSE 10.3 PPC | RISC OS 3.11 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

Anders Johansson

19:51

On Saturday 16 August 2008 18:06:40 David Bolt wrote:

...

On Sat, 16 Aug 2008, David C. Rankin wrote:-

While you've already had some answers, here's a few other tips.

...
The problem is that I cannot get sed to allow substitution of a value contained in the sed expression. So far, I can do:

for i in $(ls); do

ORIG_FNAME=$i NEW_FNAME=$(echo $i | sed -e 's/^100/`date +%Y%m%d`/')

^ ^ These aren't the same as using double-quotes. Bash won't do expansion or execution within single quoted strings.

Also, there's no need for the "echo | sed" combination. You could use:

DATE=$(date +%Y%m%s) for ORIG_FNAME in * do if [ "${ORIG_FNAME::3}" == "100" ] # check first three characters of $ORIG_FNAME then NEW_FNAME=${DATE}${ORIG_FNAME:3} else continue # skip this file fi

Why not for ORIG_FNAME in 100* do :) Anders -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

David Bolt

19:53

On Sat, 16 Aug 2008, Anders Johansson wrote:- <snip>

...

Why not

for ORIG_FNAME in 100* do

:)

Didn't think about that :/ Regards, David Bolt -- Team Acorn: http://www.distributed.net/ OGR-P2 @ ~100Mnodes RC5-72 @ ~15Mkeys SUSE 10.1 32 | | openSUSE 10.3 32b | openSUSE 11.0 32b | openSUSE 10.2 64b | openSUSE 10.3 64b | openSUSE 11.0 64b RISC OS 3.6 | TOS 4.02 | openSUSE 10.3 PPC | RISC OS 3.11 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

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participants (6)

Anders Johansson
David Bolt
David C. Rankin
Jon Clausen
Randall R Schulz
Theo v. Werkhoven