This sed trick will filter out the unwanted characters and leave only the letters ‘A’.
homer@deusexmachina ~ $ echo "###AAA" | sed 's/###//gi' AAA |
This is how to re-bind the annoying CAPS-Lock key to Esc. This can give that key a new use.
xmodmap -e 'clear Lock' -e 'keycode 0x42 = Escape' & |
Here is how to print the architecture of your Linux installation.
homer@deusexmachina ~ $ dpkg --print-architecture amd64 |
How to test disk writing speed with the Linux command line.
homer@deusexmachina ~ $ dd if=/dev/zero of=/tmp/output.img bs=8k count=256k conv=fdatasync; rm -rf /tmp/output.img 262144+0 records in 262144+0 records out 2147483648 bytes (2.1 GB) copied, 19.4116 s, 111 MB/s |
Generate a random password using /dev/urandom.
╭──(john㉿DESKTOP-PF01IEE)-[~] ╰───────────────────────────╾┋ sudo cat /dev/urandom | tr -dc _A-Z-a-z-0-9 | head -c${1:-24}; echo; ipwwJd0NwDAJ2Uby2bMoSmgZ |
Show all tcp4 listening ports.
homer@deusexmachina ~ $ netstat -lnt4 | awk '{print $4}' | cut -f2 -d: | grep -o '[0-9]*' 443 445 139 51413 53 53 631 |
Get information about your user.
homer@deusexmachina ~ $ finger homer Login: homer Name: John Cartwright Directory: /home/homer Shell: /bin/bash On since Mon Apr 21 14:14 (EST) on tty8 from :0 7 hours 13 minutes idle On since Mon Apr 21 18:48 (EST) on pts/0 from :0.0 No mail. Plan: DOS: n., A small annoying boot virus that causes random spontaneous system crashes, usually just before saving a massive project. Easily cured by UNIX. See also MS-DOS, IBM-DOS, DR-DOS.