Using SCP to transfer files

Using SCP is a great way to transfer files from one machine to another. SCP uses SSH and can move files to/from localhost remotehost or remotehost remotehost. SCP Syntax: localhost -> remotehost scp /path/to/source-file user@host:/path/to/destination-file SCP Syntax: remotehost -> remotehost scp user@src-host:/path/to/src-file user@dest-host:/path/to/dest-file SCP Examples scp file.txt mydomain.com:~/mydir/file.txt   scp local_dir/filename myname@host1:remote_dir   scp local_dir/* [...]

Use cron and ntpdate to keep your linux server’s time updated

To sync your linux server’s time with the NTP Pool Time Servers, use the following command. ntpdate pool.ntp.org If you’d like to sync with a time server weekly, add a new file named ntpdate-sync to /etc/cron.weekly. Then set the file permissions to 755 and set owner:group to root:root. Finally, exit set the file contents to [...]

Using SVN copy to branch or tag within a repository

To “branch” or “tag” within a repository, use svn copy. The syntax is simple. svn copy {SRC} {DST} The source and destination can be either a working copy path or full URL in any combination. So to tag a revision from trunk the following command could be used. svn copy –username myusername –password mypassword http://domain.com/svn/trunk [...]

Recover the MySQL Root Password in Linux

Step 1 – At the linux shell, stop the current mysqld process, start the mysqld_safe process with –skip-grant-tables switch and login as root (no password). /etc/init.d/mysql stop mysqld_safe –skip-grant-tables & mysql -u root Step 2 – At the mysql shell set the root password and flush privileges. USE mysql; UPDATE user SET password=PASSWORD("new-password-here") WHERE User=’root’; [...]

Set MySQL Root Password

To reset the MySQL root password, login to the mysql shell and run the following commands. SET PASSWORD FOR root@localhost=PASSWORD(’RootPasswordHere’); FLUSH PRIVILEGES;

Grant MySQL Privileges

To grant all privileges to a user from any location login to the mysql shell and run the following queries. GRANT ALL PRIVILEGES ON *.* TO username@localhost IDENTIFIED BY ‘PasswordHere’ WITH GRANT OPTION; GRANT ALL PRIVILEGES ON *.* TO username@"%" IDENTIFIED BY ‘PasswordHere’ WITH GRANT OPTION; FLUSH PRIVILEGES;

Apache Cache Control using mod_expires with Expires By Type

Use Apache’s mod_expires to explicitly set the expiration of a file by it’s type. This will enable to browser to cache these static assets and greatly increase performance. <IfModule mod_expires.c> ExpiresActive on ExpiresDefault "now" ExpiresByType text/html "now" ExpiresByType text/xml "now" ExpiresByType text/css "access plus 8 hours" ExpiresByType text/plain "access plus 8 hours" ExpiresByType application/x-javascript "access [...]

Using Rsync over SSH

Prerequisites First make sure that you are able to login to the remote host using ssh key authentication. Basic Syntax To sync files from a local directory to a remote directory use the following syntax: rsync {options} -e ssh {source} {dest} Example Here is an example that exclude all .psd and .fla files: rsync –exclude [...]

Using tar and gzip to Compress Files and Directories

Create and Compress and Archive Archive a group of files: tar -czvf archive.tar.gz file1 file2 file3 Archive an entire directory: tar -czvf archive.tar.gz directory/ Extract a Compressed Archive tar -xzvf archive.tar.gz List the Contents of a Compressed Archive tar -tzvf archive.tar.gz Common tar Switches -c create a new archive -x extract files from an archive [...]

SSH Login Using Public Key Authentication

Step 1: Generate Keypair on Localmachine ssh-keygen -t dsa When prompted for a passphrase you can leave it empty to enable logging in without a password (please note that there are potential security issues with doing this). After confirming your passphrase at the second prompt you’ll find two new files (the keypair) in your ~/.ssh [...]