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rated 0 times [  2] [ 0]  / answers: 1 / hits: 2831  / 2 Years ago, mon, april 4, 2022, 2:42:07

Me again with another command-line script question :)



I made a helper script that looks like this



echo 'target.bak -> target.old_bak'

mv target.bak target.old_bak

echo 'target -> target.bak'

mv target target.bak

echo 'git clone:target -> target'

git clone ssh://Shark@mcs15:29418/our-trunk-target target

cd target

echo 'Managing hooks...'

scp -p -P 29418 Shark@mcs15:/hooks/commit-msg .git/hooks/

echo '... done. Enjoy the new clone while it lasts...'


This is pretty basic but it gets my point across - it keeps the last two clones and makes a new one, I need to retain my latest clone in the target folder because i symlinked my source folder in my eclipse project to point there :D



I would like to make an improvement to this script - instead of renaming target.bak -> target.old_bak and target -> target.bak I would like the following to happen:



if bakN exists then rename bakN -> bak(N+1)

rename recursivelly bak(N-1) -> bakN

rename target to target.bak

clone new repo into target


So in case I had gone through 6 clones and I'm cloning for the seventh time I'd like this to happen:



target.bak4 -> target.bak5

target.bak3 -> target.bak4

target.bak2 -> target.bak3

target.bak1 -> target.bak2

target.bak0 -> target.bak1

target      -> target.bak0

Cloning into 'target'...


This community helped me immensely with my previous mass-diffing question so I hope you will be helpful enough to provide me with a decent way to do this one as well :)



EDIT:



The finalized script looks like this, thanks Wolfie for your major contributions.



#!/bin/bash

MYUSER="Shark"

TRUNK_FOLDER="target-on-trunk"

TARGET_FOLDER="target"



if [ -n "`ls -1d -v ${TARGET_FOLDER}.bak?`" ]; then

    echo "Pushing back numbered backups..."

    MAXBCK=`ls -1d ${TARGET_FOLDER}.bak* 2>/dev/null | egrep -o "[0-9]+$" | sort -n | tail -n1`

    if [ "$MAXBCK" != "" ]; then

        for (( c=$MAXBCK; c>=0; c-- ))

            do

                mv -v ${TARGET_FOLDER}.bak$c ${TARGET_FOLDER}.bak$(($c+1))

        done

    fi

fi



if [ -e "$TARGET_FOLDER.bak" ]; then

        mv -v ${TARGET_FOLDER}.bak ${TARGET_FOLDER}.bak0

fi



if [ -e "$TARGET_FOLDER" ]; then

        mv -v ${TARGET_FOLDER} ${TARGET_FOLDER}.bak

fi



echo "git clone: ${TRUNK_FOLDER} -> ${TARGET_FOLDER}"

git clone ssh://${MYUSER}@mcs15:29418/${TRUNK_FOLDER} ${TARGET_FOLDER}

cd ${TARGET_FOLDER}

echo 'Managing hooks...'

scp -p -P 29418 ${MYUSER}@mcs15:/hooks/commit-msg .git/hooks/

echo '... done. Enjoy the new clone while it lasts...'

More From » command-line
 Answers
5

This could help you:



For this files:



target.bak4 -> target.bak5

target.bak3 -> target.bak4

target.bak2 -> target.bak3

target.bak1 -> target.bak2

target.bak0 -> target.bak1


You can do this:



ls -1 target.bak* | awk '{print "mv "$0" "substr($0,0,length)substr($0,length,1)+1}' | sh



For target -> target.bak0 just do cp target target.bak



Update:



I tested this command and works only from 0 -> 19 backup, than the renaming fails... but for what you need is OK :)



Update #2:



Script version:



if [ $# != 1 ]; then

        echo 'Usage: $0 target'

        exit

fi

if [ `ls -1 $1* 2>/dev/null | grep -c $1` -lt 1 ]; then

        echo "No file found"

        exit

fi



MAXBCK=`ls -1 $1.bak* 2>/dev/null | egrep -o "[0-9]+$" | sort -n | tail -n1`



if [ "$MAXBCK" != "" ]; then

        for (( c=$MAXBCK; c>=0; c-- ))

        do

        #       echo $c $(($c+1))

                mv $1.bak$c $1.bak$(($c+1))

        done

fi



cp $1 $1.bak0


Example:



wolfy@wolfy-ubuntu:~/tmp$ ll

total 4

-rwxr-xr-x 1 wolfy wolfy 402 May 27 14:43 fresh_clone.sh*

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:10 test

wolfy@wolfy-ubuntu:~/tmp$ ./fresh_clone.sh test

wolfy@wolfy-ubuntu:~/tmp$ ll

total 4

-rwxr-xr-x 1 wolfy wolfy 402 May 27 14:43 fresh_clone.sh*

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:10 test

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:44 test.bak0

wolfy@wolfy-ubuntu:~/tmp$ ./fresh_clone.sh test

wolfy@wolfy-ubuntu:~/tmp$ ll

total 4

-rwxr-xr-x 1 wolfy wolfy 402 May 27 14:43 fresh_clone.sh*

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:10 test

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:44 test.bak0

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:44 test.bak1

wolfy@wolfy-ubuntu:~/tmp$ ./fresh_clone.sh test

wolfy@wolfy-ubuntu:~/tmp$ ll

total 4

-rwxr-xr-x 1 wolfy wolfy 402 May 27 14:43 fresh_clone.sh*

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:10 test

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:44 test.bak0

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:44 test.bak1

-rw-r--r-- 1 wolfy wolfy   0 May 27 14:44 test.bak2


Try with this... but keep in mind that this is only a sample code, for "production" you should add some check before running this :)



This version works with N bak files... not only 19 ;)


[#31026] Tuesday, April 5, 2022, 2 Years  [reply] [flag answer]
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