Opbzil - linux:linux-commands

bash-sc

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

Bash Shortcuts * Ctrl+R Incremental search forward, in your command-line history. * Ctrl+S Incremental search backwards, in your command-line history. * Ctrl+J and Ctrl+G: These useful commands abandon an incremental search, either with the line found, or with the original line, respectively.

fileman

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

File Manipulation Find Large files This finds the 10 largest files in the /var directory. Modify as needed # du -a /var | sort -n -r | head -n 10 Copy files from host1 to host2 via host3 # ssh vmbulkmsgtst1 -- tar cz /admin/software/ | ssh bulkmsg1 -- tar vxzC /

fs-man

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

File System Manipulation Monitor Disk Uasage # du -h --max-depth=1 Create an F/S in RAM Makes a partition in ram which is useful if you need a temporary working space, as read/write RAM access is fast. # mount -t tmpfs tmpfs /mnt -o size=1024m Harddisk Backup/Restore

fsman

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

Large Partitions RedHat Way Red Hat Enterprise Linux 5.1 and later supports ext3 filesystems up to 16 Terabytes in size. Please see the Red Hat Enterprise Linux 5 Release Notes for further information. In order to create EXT3 filesystems greater than 2TB, use the normal LVM and mkfs.ext3 commands as follows (assuming the block device for the storage is

links

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

Creating Links Always forget which is first target or link. To create a soflink here is format $ ln -s /full/path/of/original/file /full/path/of/soft/link/file

networking

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

Networking Commands Transfer files with low bandwidth Transfer large files/directories with no overhead, over the network # ssh user@host "cd targetdir; tar cfp - *" | dd of=file.tar Identify Network Cards Causes traffic lights to flash on the nic

other

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

Other Hardware Info Getting information about model no. of computer # dmidecode | grep -i prod Make ISO image of a folder # mkisofs -J -allow-lowercase -R -V "OpenCD8806" -iso-level 4 -o OpenCD.iso ~/OpenCD Show all system commands with an Explanation

process

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

Process Checking Output Detailed Process Tree for any User An easy function to get a process tree listing (very detailed) for all the processes of any gived user. # psu(){ command ps -Hcl -F S f -u ${1:-$USER}; }# psu uadminF S UID PID PPID CLS PRI ADDR SZ WCHAN RSS PSR STIME TTY TIME CMD

ram-info

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

Dealing with RAM Ram Info Get info Max RAM and RAM Slots # dmidecode 2.9 | grep "Maximum Capacity"; dmidecode -t 17 | grep Size Free up Cache'd RAM The Linux kernel makes use of unused memory in caches. This leads to fast running of the Linux O/S. But the command below will force it to drop the cached memory, if you really need to. The HTOP utility (if installed) will better show the really used & cached RAM.

users

Anonymous (anonymous@undisclosed.example.com) — 2025-10-07T09:43:40+00:00

User Creation Creating a large number of users newusers newusers command reads a file of user name and clear-text password pairs and uses this information to update a group of existing users or to create new users. Each line is in the same format as the standard password file.