If you have an IP address conflict on your network system and you want to find out what hardware is taking that IP address you can use the command “nslookup”. nslookup is a useful command used in Windows and in
Delete files older than 30 days in Linux
Delete Files Older Than 30 Days This command will delete all files older than 30 days in system /opt/backup directory. find /opt/backup -type f -mtime +30 -exec rm -f {} \; If you want to just perform the action in
Exclude certain folders from a Zip command
If you need to exclude certain folders or subdirectories from a ZIP command on Linux / Unix then use this command: zip zip_path/my_zip_file.zip -FSr zip_this_dir/ -x exclude_this_directory_from_the_zip\*
Find Sizes of Linux Directories including Subdirectories
If you want to know the total size of your folders / directories and subdirectories under this path on Linux/Unix use this code: du -h your_dir_path -d 1
Man Command
Man To find out more about a command use ‘man’ and then the command name, entering this will give you a program manual for that particular command. E.g. $ man vim Once displayed to see the next page, press the
Which Command
The which command allows you to find the location of programs contained within any of the directories listed in the $PATH variable. $which vim /usr/bin/vim
Whereis Command
The whereis command allows you to search for the location of programs that are not contained within any of the directories listed in the $PATH variable. $ whereis ifconfig ifconfig: /sbin/ifconfig /usr/share/man/man8/ifconfig.8.gz
Invoking Linux Programs
Invoking a program by using it’s Path You can execute programs by typing out the full path name and the program name at the terminal prompt: $ /bin/ls Or you can just type the program name: $ ls As long
Linux OS Directories
/bin /usr/bin Contains programs available to all users /sbin /usr/sbin Contains programs meant to be used by system administrators /var/log Contains the log files made by various applications. /home Contains all the personal directories of the users of the system
Linux System Devices Mounting and Unmounting
Devices on the system Every device on the Linux system is represented by a file in the /dev directory /dev/fd0 The first floppy drive in the computer /dev/hda The first master IDE Hard Disk Drive /dev/dsp The first audio DSP