SED – Search & Replace
December 12, 2012
Always handy to have sed in your bag of tricks:
|
1 2 3 |
sed -i 's/fromtext/totext/g' /path/to/my/file |
Always handy to have sed in your bag of tricks:
|
1 2 3 |
sed -i 's/fromtext/totext/g' /path/to/my/file |
This sed command will append / to the end of every line in filename.txt which doesn’t already have one.
|
1 2 3 |
sed -i '/\/$/!s/$/\//g' filename.txt |
We have two RackSpace Cloud Server running CentOS that need to have the web content kept in sync. Changes on either server need to be replicated to the other server. Easy way to get this accomplished is with the Unison File Syncronizer (http://www.cis.upenn.edu/~bcpierce/unison/). Here are the steps: 1. Install SSH keys for root on each server so SSH can run without passwords between the servers. 2. Add /etc/hosts file entries to map the private addresses of the servers to names.
|
1 2 3 |
192.168.10.1 web1-priv 192.168.10.2 web2-priv |
3. Install Unison on each server:
|
1 |
yum install unison227 |
4. Create a profile on each server at /root/.unison/sync_web.prf containing:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
# Reasonable defaults auto=true confirmbigdeletes=true contactquietly=true group=true maxthreads=20 numericids=true owner=true times=true # Skip confirmation batch=true # Log all sync operations log=true logfile=/var/log/unison.log # Backup deleted files backup=Name * backuplocation=central backupdir=/var/www/vhosts/mydomain.com/backup/ maxbackups=5 # Local root root=/var/www/vhosts/mydomain.com/httpdocs/ # Remote root (the double forward-slash between IP and remote path is correct) root=ssh://<font style="color:red">web2-priv</font>///var/www/vhosts/mydomain.com/httpdocs/ # Resolve conflicts in favor of local root prefer=newer # Don't sync (can specify multiple ignore lines) #ignore=Path */var/cache |
Notice the hostname “web2-priv” in red above. The file on web1 should reference web2-priv. The file on web2 should reference web1-priv. You’ll need to adjust the path listed in the file to match your environment. 5. Next create a script to run Unison with the profile created in the previous step.
For security reasons, if you want to configure nginx to hide it’s version in the server header just add: server_tokens off;
To replace all whitespace with single spaces pipe the text through:
|
1 |
tr -s [[:space:]] " " |
Reliable Penguin provides managed web hosting, systems administration, website and server migrations, and expert consulting.
Submit the form—or for immediate service call 866-649-7984.