Eureka Moment linux:shell_commands

linux:shell_commands:attitude

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Give the Linux terminal an attitude * Opan a terminal and Type “sudo visudo”. * At the bottom of the “Defaults” (near the top of the file) add, on a new line, “Defaults insults”. * Save the file. “What did I just do to my computer?

linux:shell_commands:chmod_nummeric

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Display numeric permissions using ls Create an alias for the LS command. ls -l | awk '{k=0;for(i=0;i<=8;i++)k+=((substr($1,i+2,1)~/[rwx]/) *2^(8-i));if(k)printf("%0o ",k);print}' Output should be with the nummeric permissions at the beginning of each row:

linux:shell_commands:chmod

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

CHMOD chmod g+s /path/to/parent Now, all new files and folder created under /path/to/parent will have the same group assigned as is set on /path/to/parent.

linux:shell_commands:copy_over_ssh

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Copying Files over SSH $ scp user@remote.host:file.txt /some/local/directory $ scp file.txt user@remote.host:/some/remote/directory $ scp -r dir1 user@remote.host:/some/remote/directory/dir2 $ scp user@remote.host1:/directory/file.txt user@remote.host2:/some/directory/

linux:shell_commands:cp_recent_files

Anonymous (anonymous@undisclosed.example.com) — 2020-09-02T12:19:00+00:00

Copy files younger that 24 hrs find . -mtime -1 -exec cp {} /tmp \;

linux:shell_commands:du

Anonymous (anonymous@undisclosed.example.com) — 2020-05-15T13:52:00+00:00

linux:shell_commands:exec_only_on_set_of_objects

Anonymous (anonymous@undisclosed.example.com) — 2021-03-12T14:11:48+00:00

Bash: Execute a command only on a set of objects Apply sticky bit only on folders: chmod g+s $(find . -type d)

linux:shell_commands:fdisk

Anonymous (anonymous@undisclosed.example.com) — 2025-04-09T12:42:44+00:00

Create partitions using CLI on linux First and foremost: !! WARNING !! These commands are EXAMPLES. DELETING partitions, MODIFYING and FORMATTING filesystems destroys data and/or may prevent your machine from booting. Make backups. Use at own risk. Try on a machine you don't mind losing all data on. caveat admin.

linux:shell_commands:line

Anonymous (anonymous@undisclosed.example.com) — 2021-03-12T12:28:54+00:00

Bash line shortcuts Clear line * - clear all the current line from the end to the beginning only if the cursor is at the end of the line. You can then recall the cleared line with if you need. * - clear all the current line from the beginning to the end only if the cursor is at the beginning of the line.

linux:shell_commands:mount_image_file_on_ubuntu

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Mount image file on Ubuntu mount -t udf filename.img ~/img -o loop

linux:shell_commands:numeric_permissions

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Show numeric permissions on ls ls -l | awk '{k=0;for(i=0;i<=8;i++)k+=((substr($1,i+2,1)~/[rwx]/)*2^(8-i));if(k)printf("%0o ",k);print}'

linux:shell_commands:rsync_backup

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Rsync mirror folders rsync -av --delete --log-file=/home/user/logs/backup_$(date +%Y%m%d).log /server/Pictures /raid/Pictures/ * /server/Pictures copies the Pictures folder * /server/Pictures/ copies the contents od the Pictures folder * /raid/Pictures/ copies into the Pictures folder

linux:shell_commands:send_messages_to_users

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Send messages to other users # Findout who is logged on $ who su pts/0 2019-05-14 08:15 (172.16.11.44) jack pts/1 2019-05-14 09:47 (172.16.11.44) # Broadcast a message $ wall "System will go down in a minute!" Broadcast message from su@hweb (pts/0) (Tue May 14 09:48:18 2019): System will go down in a minute! # Broadcast a message, but do not display the banner (available only to root) wall -n "System will go down in a minute!" System will go down in a minute! …

linux:shell_commands:start

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Shell Commands * .bashrc up * Bash line shortcuts * Bash: Execute a command only on a set of objects * CHMOD * Copy files younger that 24 hrs * Copying Files over SSH * Create partitions using CLI on linux * Display numeric permissions using ls * du examples * Examples of Variables and Arrays in Bash * Give the Linux terminal an attitude * Mount image file on Ubuntu * Rsync mirror folders * Search for files with specific text in them * Send messages to other users * Show nume…

linux:shell_commands:string_search

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Search for files with specific text in them find /var/www -type f -exec grep -l '/sync-clients/' {} \; This will output all files with the specified string. The path in example is /var/www, and string we search for is /sync-clients/ grep -iRl 'text' .

linux:shell_commands:tar

Anonymous (anonymous@undisclosed.example.com) — 2019-10-31T09:05:00+00:00

Tar / Untar tar -zcvf archive-name.tar.gz directory-name Where, * -z : Compress archive using gzip program in Linux or Unix * -c : Create archive on Linux * -v : Verbose i.e display progress while creating archive * -f : Archive File name

linux:shell_commands:up

Anonymous (anonymous@undisclosed.example.com) — 2022-02-18T07:41:47+00:00

.bashrc up To cd up a certain number of times, add this to your .bashrc file up() { local d="" local limit="$1" if [ -z "$limit" ] || [ "$limit" -le 0 ]; then limit=1 fi for ((i=1;i<=limit;i++)); do d="../$d" done if ! cd "$d"; then echo "Path shallower than $limit"; fi }

linux:shell_commands:var_and_arr

Anonymous (anonymous@undisclosed.example.com) — 2021-04-19T13:56:11+00:00

Examples of Variables and Arrays in Bash var="http://wiki.plecko.hr/" echo $var http://wiki.plecko.hr/ echo ${#var} 31 echo ${!var} echo ${!U*} UID USER USERNAME echo ${var:7} wiki.plecko.hr/ echo ${var:11:6} plecko