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1D1C - shasum
by Dhanasekar 14 Feb '23

14 Feb '23

shasum - Print or Check SHA Checksums syntax $ shasum [OPTION]... [FILE]... $ cat sha_example.txt This is test message for shasum $ shasum sha_example.txt $ sha1sum sha_example.txt $ sha256sum sha_example.txt or $ shasum -a 256 sha_example.txt $ sha512sum sha_example.txt To generate the SHA value for text on the console $ sha256sum -t This is test message (Enter) Ctrl+d regards, T.Dhanasekar

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1D1C - shar
by Dhanasekar 13 Feb '23

13 Feb '23

shar - create a shell archive $ sudo apt install sharutils provides shar package To create a shar archive file. $ shar *.txt > mytext.shar $ shar *.pdf > mypdf.shar $ shar *.mp3 > mymp3.shar $ shar *.c > myc.shar remove all .txt , .pdf , .mp3 , .c files and then, To extract shar archive file $ unshar mytext.shar $ unshar mypdf.shar $ unshar mymp3.shar $ unshar myc.shar regards, T.Dhanasekar

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300 linux commands with examples cheat sheet
by Dhanasekar 12 Feb '23

12 Feb '23

Hi 300 linux commands with examples compiled from 1 Day 1 Command as long cheat sheet upload @ https://github.com/tkdhanasekar/linux_commands_examples/blob/main/linux_300… regards, T.Dhanasekar

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1D1C - sha1sum , sha256sum
by Dhanasekar 12 Feb '23

12 Feb '23

sha1sum - compute and check SHA1 message digest syntax $ sha1sum [OPTION] [FILE_NAME] To create the SHA-1 of a file $ sha1sum example.txt To create the SHA-256 of a file $ sha256sum example.txt To write the SHA-1 of a file to a file $ sha1sum example.txt > example.sha1 add some contents to example.txt and check with $ sha1sum -c example.sha1 example.txt: FAILED sha1sum: WARNING: 1 computed checksum did NOT match updated the SHA-1 file against the example.txt $ sha1sum new.txt > example.sha1 $ sha1sum -c example.sha1 example.txt: OK To forcefully change the command’s capabilities to read in binary mode $ sha1sum -b example.sha1 To print help commands $ sha1sum - -help To get a list of other sha-related commands $ sha regards, T.Dhanasekar

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1D1C - sh
by Dhanasekar 11 Feb '23

11 Feb '23

sh - is a command language interpreter that executes commands read from a command line string, the standard input, or a specified file. To Invoke the Bourne shell $ sh To run the bash script $ sh example.sh regards, T.Dhanasekar

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1D1C - sg
by Dhanasekar 10 Feb '23

10 Feb '23

sg - execute command as different group ID To execute command as different group ID $ sg group-name -c 'command' $ sg dev-group -c 'sleep 100' $ sg admin-group -c 'ping 8.8.8.8' regards, T.Dhanasekar

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1D1C - sftp
by Dhanasekar 09 Feb '23

09 Feb '23

sftp - is a secure remote file transfer utility based on File Transfer Protocol (FTP) To Connect to SFTP $ sftp user(a)192.168.122.50 sftp> To get help commands sftp> help To Check Present Working Directory local working directory sftp> lpwd remote working directory sftp> pwd To List files with sftp On Remote sftp> ls On local machine sftp> lls To upload file using sftp sftp > put sample.py To upload multiple files using sftp sftp > mput *.py To download files using sftp sftp > get example.py To download multiple files using sftp sftp > mget *.pl To switching directories in sftp On Remote sftp > cd Documents on local machine sftp > lcd Documents To create new directory on local sftp > mkdir local_dir To create new directory on remote sftp > lmkdir remote_dir To remove directories using sftp sftp > rm file.txt sftp> rmdir dir1 To exit sftp shell sftp > exit regards, T.Dhanasekar

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1D1C - sfdisk
by Dhanasekar 08 Feb '23

08 Feb '23

sfdisk - display or manipulate a disk partition table To display partitions of all the disks in system $ sudo sfdisk -l To view disk partitions of a specific device $ sudo sfdisk -l /dev/vda To display Total Partition Size $ sudo sfdisk -s To display Partition size of specific partition $ sudo sfdisk -s /dev/vda To dump disk partition details to text file $ sudo sfdisk -d /dev/vda > vda.out To display Disk Geometry for Debugging $ sudo sfdisk -G To display the kernel’s idea of the geometry of the device $ sudo sfdisk -g To display All Disk Partition types $ sudo sfdisk -T To display the partition type of a specific partition $ sudo sfdisk --print-id /dev/vda 1 regards, T.Dhanasekar

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1D1C - setsid
by Dhanasekar 07 Feb '23

07 Feb '23

setsid - run a program in a new session syntax $ setsid [options] program [arguments] $ cat add.sh #!/bin/bash # Take input from user and calculate sum. read -p "Enter first number: " num1 read -p "Enter second number: " num2 sum=$(( $num1 + $num2 )) echo "Sum is: $sum" :x To execute shell script in a new session. $ sudo setsid ./add.sh To set the controlling terminal to the current one. $ sudo setsid -c ./add.sh To wait for the execution of the program to end, and return the exit value of this program as the return value of setsid $ setsid -w ./add.sh regards, T.Dhanasekar

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1D1C - setfacl
by Dhanasekar 06 Feb '23

06 Feb '23

setfacl - set file access control lists syntax $ setfacl option file To modify ACLs of file to give read and write permission to user1 $ setfacl -m u:user1 rw file To remove all extended ACL entries $ setfacl -b file.txt To remove entries from the ACL of file, To remove group 'ilugc' from a file's ACL $ setfacl -x g:ilugc file.txt To remove the default ACL $ setfacl -k file To apply operations to all files and directories recursively $ setfacl -m g:ilugc:rw -R directory To restore a permission backup $ setfacl --restore=file To copy the ACL of one file to another $ getfacl example.txt | setfacl --set-file=- f sample.txt regards, T.Dhanasekar

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