Login or Register to Ask a Question and Join Our Community


unexpected pipeline result with find -exec


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting unexpected pipeline result with find -exec
# 1  
Old 02-19-2008
Lightbulb unexpected pipeline result with find -exec

Hi All,

I probably miss something fundamental here.
I want to rename a bunch of files in subdirectories (that might contain white spaces) with names that are related.

I thought following could do the job:
Code:
find . -name *.sh -exec mv {} $(echo {} | sed -e 's/0/1/g') \;

Now to be able to see the output I generate an echo of the substitutes:
Code:
find . -name *.sh -exec echo {} $(echo {} | sed -e 's/0/1/g') \;

Interestingly echo {} equals echo {} | sed -e 's/0/1/g'.
It looks like the substitution of {} is somehow not done in the order I expected.

If I try the pipelining directly (without ${..}) it generates the right substitution (but for my purpose not usable):
Code:
find . -name *.sh -exec echo {} $(echo "2001" | sed -e 's/0/1/g') \;

Thank you very much for any idea pointing out my mistake,
best,
blued
# 2  
Old 02-20-2008
Error

Thanks for your interest!
To soliloquize further I think the answer is that it can't work - according to the man pages:
-exec utility [argument ...] ;
[..] If the string ``{}'' appears anywhere in the utility name or the arguments it is replaced by the pathname of the current file.
[..] Utility and arguments are not subject to the further expansion of shell patterns and constructs.

Please correct me if I am wrong,
thanks anyway,
blued.
# 3  
Old 02-20-2008
use xargs -
Code:
find /path | xargs  <command set goes here>
#example
find /path -type f | xargs mv "{}" "{}"".old"

except I think you would be better served with a loop
Code:
find /path -type -f  -name '*.sh' | \
while read file
do
     echo "$file"  # the code you have makes no sense to me, so change this line
     # maybe you want to add 2001 to the file name, I cannot tell.
     # you are sed-ing 2001 for some reason.
     mv "$file" "$file".2001
done

You should add code to get rid of space - maybe repalce them with underlines. Unless spaces are a required feature.
# 4  
Old 02-20-2008
Thanks for the reply. "2001" is only a place holder.

If I only wanted to add something to the filename
Code:
find . -name *.sh -exec mv {} {}.add_something \;

would work anyway.
But I wanted to process the filename; using xargs seem to suffer a similar limitation: the replacement string can't be fed into $(sed ...) or another way of processing.

Code:
find . -name "*.cpp" | xargs -I name mv name $(echo name|sed -e s/old/new/g)

In this case the string name will be fed unprocessed into sed instead of the xarg replacement.

Thanks,
best,
blued
# 5  
Old 02-20-2008
Maybe you're looking for something like this:

Code:
find . -name "*.cpp" | sed 's/\(.*\)\(old\)\(.*\)/mv & \1new\3/' | sh

Before you run the command try this to be sure you get the right command:

Code:
find . -name "*.cpp" | sed 's/\(.*\)\(old\)\(.*\)/mv & \1new\3/'

Regards
# 6  
Old 02-23-2008
MySQL

Thanks for the reply!

As you can see it took me a while to understand what this is doing...
But it is exactly what I was looking for!
Dodgy script!

Great!
Thank you very much!
blued
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Linux find command seems to not transmit all the result to the '-exec command'

Hello. From a script, a command for a test is use : find /home/user_install -maxdepth 1 -type f -newer /tmp/000_skel_file_deb ! -newer /tmp/000_skel_file_end -name '.bashrc' -o -name '.profile' -o -name '.gtkrc-2.0' -o -name '.i18n' -o -name '.inputrc' Tha command... (3 Replies)
Discussion started by: jcdole
3 Replies

2. UNIX for Beginners Questions & Answers

Unexpected result from awk

Hello, Giving those commands: cat > myfile 1 2 3 ^D cat myfile | awk '{ s=s+$1 ; print s}' The output is: 1 3 6 It seems like this command iterates each time on a different row so $1 is the first field of each row.. But what caused it to refer to each row ?. What I mean... (3 Replies)
Discussion started by: uniran
3 Replies

3. Shell Programming and Scripting

2 exec in find

Guys, I want to find the log files greather than 23 days and i want to perform 2 things here. one is to list the files and second is to gzip the files. hope this can be done using sh -c option. but not sure the exact command. find . -name "*.log" -mtime +23 -exec ls -la {} \; ... (5 Replies)
Discussion started by: AraR87
5 Replies

4. UNIX for Dummies Questions & Answers

Weird: unexpected result after piping a sort

Hello, And when you think you know the basics of something, UNIX in this case, something like what I will describe below comes along.... On a Linux system, a "typical" directory with some files. Say 20. I do: > ls | sort > mylisting Now when I: > vi mylisting There is mylisting... (13 Replies)
Discussion started by: stavros
13 Replies

5. Shell Programming and Scripting

find: missing argument to `-exec' while redirecting using find in perl

Hi Friends, Please help me to sort out this problem, I am running this in centos o/s and whenever I run this script I am getting "find: missing argument to `-exec' " but when I run the same code in the command line I didn't find any problem. I am using perl script to run this ... (2 Replies)
Discussion started by: ramkumarselvam
2 Replies

6. Ubuntu

Find and exec

Hello, I am a linux newbe. I want to install a program. I can download it only with wget command from internet. As far as i know this wget command does not transfer the exacutable flags. Because of that i wanted to find all configure files and change their mod to 744. I found this... (1 Reply)
Discussion started by: disconnectus
1 Replies

7. Shell Programming and Scripting

shell script - unexpected result

I hv a file --am executing a script which is giving me unexpected results COntents of file: f1 CMT_AP1_CONT:/opt/sybase/syboc125:150:ASE12_5::Y:UX: CMT_AP1:/opt/sybase/syboc125:150:ASE12_5::Y:UX f1.tmp CMT_AP1_CONT:/opt/sybase/syboc125:150:ASE12_5::Y:UX:... (2 Replies)
Discussion started by: rajashekar.y
2 Replies

8. UNIX for Dummies Questions & Answers

Find Exec

Hello All, Is there a way to make exec do a couple of operations on a single input from find? For example, find . -type d -exec ls -l "{}" ";" I would like to give the result of each "ls -l" in the above to a wc. Is that possible? I want to ls -l | wc -l inside... (1 Reply)
Discussion started by: prasanna1157
1 Replies

9. Shell Programming and Scripting

Help! Paste Multiple SQL output result to exec command

Hi, I want to write the shell script to change multple file name (the file name is get from DB) e.g. cp db1.txt file1_new.txt cp db2.txt file2_new.txt cp db3.txt file3_new.txt I have write the script like this: VAR=`sqlplus -s $LOGON @<<ENDOFTEXT set termout off ... (0 Replies)
Discussion started by: jackyntk
0 Replies

10. Shell Programming and Scripting

Unexpected sed result.

I am in the process of writing a script to change the grub password in the grub.conf file. I thought I had it figured out, but am running into an a problem I can't put my finger on. Command I am running when I find that the grub.conf file contains "password --md5". sed... (1 Reply)
Discussion started by: viRaven
1 Replies
Login or Register to Ask a Question

Featured Tech Videos