Often used Commands

Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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# 20.5. Often used Commands

The commands listed below are some that we use often, but many more exist. Check the man page for more details and information.

Quota. Quota displays users' disk usage and limits on a file system. To display user disk usage and limits, use the command:

                      [root@deep] /# quota -u wahib

                      Disk quotas for user wahib (uid 501):
                      Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
                      /dev/sda6    6001*   6000       0    none       7       0       0

To display group quotas for the group of which the user is a member, use the command:

                      [root@deep] /# quota -g wahib

                      Disk quotas for group wahib (gid 501):
                      Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
                      /dev/sda6    5995*   5000       0    none       1       0       0

If the group quota is not set for the user specified, you will receive the following message:

                      Disk quotas for group wahib (gid 501): none

Repquota . Repquota produces summarized quota information of the disk usage and quotas for the specified file systems. Also, it prints for each user the current number of files and amount of space used (in kilobytes). Here is a sample output repquota gives you results may vary:

                      [root@deep] /# repquota -a

                                 Block limits               				File limits
                      User        	    	used    	soft    	hard  	grace  	used  	soft    	hard		grace
                      Roo		--	21       	0       	0       4    	0   	0
                      Named	        --	6               0       	0       5     	0       0
                      Admin	        --  	388657	        0       	0       21      21      0     		0
                      Wahib	        --    	6001            0       	0       7     	0     	0

                                 Block limits               				File limits
                      User      	      	used    	soft    	hard  	grace    	used  	soft	hard  	        grace
                      root      	--      21       	0       	0       4     	        0	0
                      named     	--      6       	0       	0       5     	        0       0
                      admin     	--  	388657	        0       	0       2121            0       0
                      wahib     	--    	6001    	6000       	0   	none            7	0   	0

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