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How to rename file-using shellscript?

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# 1  
Old 12-07-2011
How to rename file-using shellscript?
Hi All,

need your help in renaming the file ? Please read the below data carefully. Its may b simple for you :-) just information is too long

Code:
Eg-home/user01/exercise   contains 
 
abc.log, ppp.log ,shd.log
 
want to rename this file with timestamp using shellscript


for this i have created shellscript

Code:
 
#! /bin/bash
cd /home/user01/exercise
 
exercise=/home/user01/exercise
 
mDate=$(date +%Y%m%d%H:%M:%S)
for mFName in $exercise/*.log; do
  mPref=${mFName%.log}
 mv ${mFName} ${mPref}.${mDate}.log
done


using above code my file is going to rename as


Code:
 
abc.2011120706:54:59.log
ppp.2011120706:54:59.log
shd.2011120706:54:59.log

up to this everythig is ok. now my problm is that if i have created again new abc.log in this folder again it will accept .

now my exercise folder contains

Code:
 
abc.log
abc.2011120706:54:59.log
ppp.2011120706:54:59.log
shd.2011120706:54:59.log


now if i run the above script for renaming the log files then it will give me the below result (which i dont want )

Code:
 
abc.2011120710:59:40.log
abc.2011120706:54:59.2011120710:59:40.log
ppp.2011120706:54:59.2011120710:59:40.log
shd.2011120706:54:59.2011120710:59:40.log

my aim is to rename any new files ones .it should not increase the timestamp details at files as it is incresing the file name size .and also it useless for me.


MY AIM IS , SECOND TIME IT SHOULD RENAME ONLY abc.log

OUTSHOULD LOOK LIKE

Code:
 
abc.2011120710:59:40.log
abc.2011120706:54:59.log
ppp.2011120706:54:59.log
shd.2011120706:54:59.log


pLEASE HELP ME IN MODIFYING THE ABOVE SCRIPT.


Thanks
Last edited by aish11; 12-07-2011 at 07:12 AM..
# 2  
Old 12-07-2011
Code:
#! /bin/bash
cd /home/user01/exercise
 
exercise=/home/user01/exercise
 
mDate=$(date +%Y%m%d%H:%M:%S)
for mFName in $exercise/*.log
do
    mPref=${mFName%.log}
    echo $mPref | egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}"
    [ $? -eq 0 ] && continue
    mv ${mFName} ${mPref}.${mDate}.log
done

This User Gave Thanks to balajesuri For This Post:
aish11
# 3  
Old 12-08-2011
Hi balajesuri,

Thanks for the help ...


but getting below error

Code:
 
mv: cannot stat `/*.log': No such file or directory

---------- Post updated at 11:09 PM ---------- Previous update was at 10:53 PM ----------

hey thanks a lot , its working properly Smilie


can u plz explain me the below code what it exactly does


Code:
 
echo $mPref | egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}"

# 4  
Old 12-08-2011
--> Value in $mPref is echo'd to egrep.
--> egrep stands for extended grep (look for manpages of grep option -E)
--> -q option is to suppress the output.. used to silence grep even when a match is found.
--> "\.[0-9]{10}:[0-9]{2}:[0-9]{2}" is a pattern which will look for a dot followed by a 10-digit number, a colon, a 2-digit number, a colon, a 2-digit number.
# 5  
Old 12-08-2011
MySQL
Code:
echo $mPref | egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}"

the Variable "$mPref" will contain the file name.
the filename is echoed and the file name is checked whether it has been already formatted or not. if it is already formatted it will continue to the next filename else it will move that file.

That egrep uses a regular expression,

egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}"
.[0-9]{10}: - This looks for a ten digit number followed by a colon.
[0-9]{2}: - This looks for a two digit number followed by a colon.
[0-9]{2} - This looks for a two digit number.

which in turn matches the numbers given below format , which is in your formatted file names,

abc.2011120710:59:40.log
--------------------------------
Late reply
Last edited by Kesavan; 12-08-2011 at 01:14 AM.. Reason: Post is answered already
# 6  
Old 12-08-2011
Thank U.


Need one more help plz,

Do u have any studymaterial for learning the shellscript containing simple examples. and also i want to learn awk , sed command. Need some simple example for learning this .

---------- Post updated at 12:40 AM ---------- Previous update was at 12:31 AM ----------

Quote:
Originally Posted by Kesavan
Code:
echo $mPref | egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}"

the Variable "$mPref" will contain the file name.
the filename is echoed and the file name is checked whether it has been already formatted or not. if it is already formatted it will continue to the next filename else it will move that file.

That egrep uses a regular expression,

egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}"
.[0-9]{10}: - This looks for a ten digit number followed by a colon.
[0-9]{2}: - This looks for a two digit number followed by a colon.
[0-9]{2} - This looks for a two digit number.

which in turn matches the numbers given below format , which is in your formatted file names,

abc.2011120710:59:40.log
--------------------------------
Late reply



i need to clarify the below things -just giving example from single file name. if i am wrong plz let me know

1)mFName contains abc.log?

2) mPref contains abc ?

3)meaning of "echo $mPref | egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}" "

means if any log file having parameter like \.[0-9]{10}:[0-9]{2}:[0-9]{2}" then it should negelct that file and goes to next line ??
# 7  
Old 12-08-2011
1) Yes
2) Yes
3) `echo $mPref | egrep -q "\.[0-9]{10}:[0-9]{2}:[0-9]{2}"` will not neglect current file. The skipping part is done by next line "[ $? -eq 0 ] && continue" which means, if the exit status of last run command is 0, then skip to next iteration (in this case next file)
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