August 2023 - ILUG-D - lists.fsci.in

1D1C - disown
by Dhanasekar 11 Aug '23

11 Aug '23

disown - it is used to remove jobs from the job table $ ping google.com ^Z To list all current jobs $ jobs -l To remove all jobs $ disown -a To remove specific jobs $ disown %1 To remove the last job on the job table $ disown To remove currently running jobs $ disown -r To keep jobs running after log out $ disown -h <job_ID> regards, T.Dhanasekar

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1D1C - declare
by Dhanasekar 10 Aug '23

10 Aug '23

declare - it is used to declare shell variables and functions, set their attributes and display their values To declare a variable $ declare var $ var=65 To display the options and attributes of each variable name $ declare -p To declare a variable with a string value of all capital letters $ declare -l strvar="WELCOME TO ILUGC" To declare a variable with a string value of all small letters $ declare -u strvar="welcome to ilugc" regards, T.Dhanasekar

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1D1C - pidstat
by Dhanasekar 09 Aug '23

09 Aug '23

pidstat - Report statistics for Linux tasks. To report statistics for Linux tasks $ pidstat To display statistics for specific process id $ pidstat -p <pid_number> To display only tasks whose command name includes the string comm $ pidstat -C apache2 $ pidstat -C mysql To report I/O statistics $ pidstat -d To display all activities horizontally on a single line $ pidstat -h To display the process command name and all its arguments $ pidstat -l To report page faults and memory usage $ pidstat -r To display statistics for threads associated with selected tasks $ pidstat -t To report CPU usage $ pidstat -u To Report task switching activity $ pidstat -w regards, T.Dhanasekar

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1D1C - ifstat
by Dhanasekar 08 Aug '23

08 Aug '23

ifstat - Report InterFace STATistics To display statistics for all interfaces $ ifstat To Enable monitoring of all interfaces found for which statistics are available $ ifstat -a To hide interface which counters are null $ ifstat -z To add timestamp at the beginning of each line $ ifstat -t To Wrap lines that are larger than the terminal width (implies -w). Wrapped lines are prefixed with a cycling letter to ease reading $ ifstat -W To report bandwidth in kbits/sec instead of kbytes/sec. $ ifstat -b To displays version and the compiled-in drivers $ ifstat -v regards, T.Dhanasekar

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1D1C - ionice
by Dhanasekar 07 Aug '23

07 Aug '23

ionice - set or get process I/O scheduling class and priority syntax $ ionice -c <scheduling class> -n <priority value> <options><command> To set process with PID 89 as an idle I/O process $ ionice -c 3 -p 89 To run bash program with highest priority. $ ionice -c 2 -n 0 bash To Print the class and priority of the processes with PID 89 and 91. $ ionice -p 89 91 $ ionice -p <PID1> <PID2> regards, T.Dhanasekar

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1D1C - exit
by Dhanasekar 06 Aug '23

06 Aug '23

exit - cause normal process termination To terminate out from root shell root@ilugc:~# exit exit To terminate the shell for the user $ exit regards, T.Dhanasekar

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1D1C - ipset
by Dhanasekar 05 Aug '23

05 Aug '23

ipset is used to set up, maintain and inspect so called IP sets in the Linux kernel To create ip set called hacker_ips $ sudo ipset -N hacker_ips iphash To add IP address to the hacker_ips ipset $ sudo ipset -A hacker_ips 172.122.150.22 $ sudo ipset -A hacker_ips 192.168.100.22 To drop all ip address stored in ipset called hacker_ips $ iptables -A INPUT -m set --set hacker_ips src -j DROP To create ipset named my_blacklist $ sudo ipset create my_blacklist hash:ip hashsize 4096 To drop all ip address stored in ipset called my_blacklist $ sudo iptables -A INPUT -m set --set my_blacklist src -j DROP To add IP address in ipset my_blacklist $ sudo ipset add my_blacklist 192.168.100.22 $ sudo ipset add my_blacklist 172.122.150.22 $ sudo ipset add my_blacklist 192.168.100.10/24 To make ipset persistent across reboots $ sudo ipset save > /etc/ipset.conf To view the sets $ sudo ipset -L To delete a set named hacker_blacklist $ sudo ipset -X hacker_blacklist To delete all sets $ sudo ipset destroy regards, T.Dhanasekar

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1D1C - updatedb
by Dhanasekar 04 Aug '23

04 Aug '23

updatedb - update a database for plocate To refresh database content for locate command $ sudo updatedb To print paths of files as they are found $ sudo updatedb --verbose regards, T.Dhanasekar

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1D1C - ipcalc
by Dhanasekar 04 Aug '23

04 Aug '23

ipcalc - An IPv4 Netmask/broadcast/etc calculator To calculate subnet for 192.168.122.10/16 $ ipcalc 192.168.122.10/16 To calculate subnet for 192.168.122.10/16 without display ANSI color codes $ ipcalc -n 192.168.122.10/16 To Suppress the bitwise output $ ipcalc -b 192.168.122.10/16 To Deaggregate address range $ ipcalc -r 192.168.122.1 192.168.122.101 $ ipcalc -r 10.10.0.1 10.10.1.1 $ ipcalc -r 172.122.150.10 172.155.150.20 regards, T.Dhanasekar

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1D1C - sipcalc
by Dhanasekar 03 Aug '23

03 Aug '23

sipcalc - IP subnet calculator To calculate subnets for 192.168.122.1/24 $ sipcalc 192.168.122.1/24 To calculate subnets for 192.168.122.1/16 $ sipcalc -i 192.168.122.1/16 regards, T.Dhanasekar

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ILUG-D August 2023