Linux shell commands tips and tricks

Linux shell commands tips and tricks:

 
     Keep in mind that for some commands you will need to install additional software on your Linux distribution.

SSH debug mode:
    $ ssh -vvv user@ip_address   

SSH with pem key:

     $ ssh user@ip_address -i key.pem    

Create war file:

     $ jar -cvf name.war file    

Test disk read speed:

     $ hdparm -Tt /dev/sda    

Get md5 hash from text:

     $ echo -n "text" | md5sum    

Check xml syntax:

     $ xmllint --noout file.xml    

Extract tar.gz in new directory:

     $ tar zxvf package.tar.gz -C new_dir    

Get HTTP headers with curl:

     $ curl -I http://www.example.com      

Modify timestamp of some file or directory (YYMMDDhhmm):

     $ touch -t 0712250000 file    

Download from ftp using wget:

     $ wget -m ftp://username:password@hostname    

Generate random password (16 char long in this case):

     $ LANG=c < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;    

Quickly create a backup of a file:

     $ cp some_file_name{,.bkp}    

Access Windows share:

     $ smbclient -U "DOMAIN\user" //dc.domain.com/share/test/dir    

Run command from history (here at line 200):

     $ !200    

Unzip to directory:

     $ unzip package_name.zip -d dir_name    

Show free RAM in MB:

     $ free -m | grep cache | awk '/[0-9]/{ print $4" MB" }'    

Git clone specific branch (master):

     $ git clone git@github.com:name/app.git -b master    

Git switch to another branch (develop):

     $ git checkout develop    

Git delete branch (mybranch):

     $ git branch -d mybranch    

Git delete remote branch:

     $ git push origin :branchName    

Git push new branch to remote:

     $ git push -u origin mynewfeature    

List all supported kill signals:

     $ kill -l