This sed command will append / to the end of every line in filename.txt which doesn’t already have one. sed -i ‘/\/$/!s/$/\//g’ filename.txt Bookmark on Delicious Digg this post Recommend on Facebook share via Reddit Share with Stumblers Tweet about it Subscribe to the comments on this post Print for later Bookmark in Browser Tell [...]
This sed command will append / to the end of every line in filename.txt which doesn’t already have one.
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 [...]
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.
192.168.10.1 web1-priv 192.168.10.2 web2-priv
3. Install Unison on each server:
yum install unison227
4. Create a profile on each server at /root/.unison/sync_web.prf containing:
# 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://web2-priv///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. Name the script /root/sync_web.sh and make it executable.
#!/bin/bash export HOME=/root unison sync_web
6. Add an entry to /etc/cronjob to run Unison once per minute:
*/1 * * * * root /root/sync_web.sh > /tmp/sync.log 2>&1
Everything should now be ready to go. You can test by running the sync_web.sh script manually on each server. If there are no errors then try adding, changing and removing files on both servers and verify that the changes are synced within one minute.
For security reasons, if you want to configure nginx to hide it’s version in the server header just add: server_tokens off; Bookmark on Delicious Digg this post Recommend on Facebook share via Reddit Share with Stumblers Tweet about it Subscribe to the comments on this post Print for later Bookmark in Browser Tell a friend
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: tr -s [[:space:]] ” ” Bookmark on Delicious Digg this post Recommend on Facebook share via Reddit Share with Stumblers Tweet about it Subscribe to the comments on this post Print for later Bookmark in Browser Tell a friend
To replace all whitespace with single spaces pipe the text through:
tr -s [[:space:]] " "
Here’s an alpha sort of the values of the associative array named “myarray”: foreach my $key (sort {$myarray{$a} cmp $myarray{$b}} keys %myarray) { print “$key : ” . $myarray{$key} . “\n”; }; And here’s the same sort numerically: foreach my $key (sort {$myarray{$a} $myarray{$b}} keys %myarray) { print “$key : ” . $myarray{$key} . “\n”; [...]
Here’s an alpha sort of the values of the associative array named “myarray”:
foreach my $key (sort {$myarray{$a} cmp $myarray{$b}} keys %myarray) {
print "$key : " . $myarray{$key} . "\n";
};
And here’s the same sort numerically:
foreach my $key (sort {$myarray{$a} <=> $myarray{$b}} keys %myarray) {
print "$key : " . $myarray{$key} . "\n";
};
And if you want numeric descending:
foreach my $key (sort {$myarray{$b} <=> $myarray{$a}} keys %myarray) {
print "$key : " . $myarray{$key} . "\n";
};
