Difference between revisions of "Linux commands"

Revision as of 07:16, 12 August 2011

restore from backup with rsync

rsync -navu foldertorestore user@domain.com:/path/to/parent/of/foldertorestore

-n is to test

Find all symbolic links to a specific directory

find -maxdepth 4 -type l -exec stat {} \; | grep /usr/local/trunk

Remove all .svn directories except for the actual theme dirs

find ! -path "*/ThemeName/*" -name .svn -type d -exec rm -Rf {} \;

Migrate maildirs from Courier to Dovecot

Got courier-dovecot-migrate.pl from http://wiki.dovecot.org/Migration/Courier

Old structure of maildirs was domain/user/.maildir I needed to convert that to domain/user with the script below

#!/bin/bash
./courier-dovecot-migrate.pl --to-dovecot --recursive --convert domaindirectory
for f in `find -name .maildir`; do
  PARENT=`dirname $f`
  mv $f/* $f/.[^.]* $PARENT
done

Bulk rename files

Rename all en. to et. in files down the tree with find:

find -type f -exec rename -v -n 's/en\./et\./' {} \;

source: http://tips.webdesign10.com/how-to-bulk-rename-files-in-linux-in-the-terminal

Copy a large amount of data to another server

This is faster then rsync because it doesn't do any file analysis:

tar cf - filesORdir | ssh HOSTorIP "(cd /where/to/copy; tar xf -)"

Script to migrate a linux system to a fresh system

TARGET=root@freshHostNameOrIP

1. Set to true to migrate the users above uid 500

MIGRATEUSERS=1

1. Adjust source to transfer

SOURCES="/etc/ssh/ssh_host_dsa_key.pub /etc/ssh/ssh_host_dsa_key /etc/ssh/ssh_host_rsa_key /etc/ssh/ssh_host_rsa_key.pub /root/passwd.mig /root/shadow.mig /root/group.mig /quota.user /quota.group /home/ /var/backup/"

export UGIDLIMIT=500

awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd > /root/passwd.mig

awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/group > /root/group.mig

awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534) {print $1}' /etc/passwd | tee - |egrep -f - /etc/shadow > /root/shadow.mig

for source in $SOURCES; do

1. -H is very important to preserve hard links!

rsync -vaH -e "ssh -i /root/.ssh/id_rsa" $source $TARGET:$source done

if [ $MIGRATEUSERS -eq 1 ]; then ssh -i /root/.ssh/id_rsa $TARGET "cat /root/passwd.mig >> /etc/passwd" ssh -i /root/.ssh/id_rsa $TARGET "cat /root/shadow.mig >> /etc/shadow" ssh -i /root/.ssh/id_rsa $TARGET "cat /root/group.mig >> /etc/group" fi