Commands by anapsix (5)

  • Display Spinner while waiting for some process to finish

    alternatively, run the spinner for 5 seconds: timeout 5 bash -c 'spinner=( Ooooo oOooo ooOoo oooOo ooooO oooOo ooOoo oOooo); while true; do for i in ${spinner[@]}; do for j in seq 0 ${#i}; do echo -en "\b\b"; done; echo -ne "${i}"; sleep 0.2; done; done' Show Sample Output


    2
    while kill -0 0; do timeout 5 bash -c 'spinner=( Ooooo oOooo ooOoo oooOo ooooO oooOo ooOoo oOooo); while true; do for i in ${spinner[@]}; do for _ in seq 0 ${#i}; do echo -en "\b\b"; done; echo -ne "${i}"; sleep 0.2; done; done'; done
    anapsix · 2015-05-07 19:13:08 3
  • get a random 0/1, use it for on/off, yes/no

    use it to add a random boolean switch to your script Show Sample Output


    4
    echo $[RANDOM % 2]
    anapsix · 2013-05-25 19:15:57 3
  • get a random number in bash

    use it to stagger cronjob or to get a random number increase the range by replacing 100 with your own max value Show Sample Output


    -2
    echo $[RANDOM % 100] # range 0-99
    anapsix · 2013-05-25 19:02:00 0
  • Check if system is 32bit or 64bit


    16
    arch
    anapsix · 2013-01-02 17:52:14 3
  • Find all active ip's in a subnet

    nmap for windows and other platforms is available on developer's site: http://nmap.org/download.html nmap is robust tool with many options and has various output modes - is the best (imho) tool out there.. from nmap 5.21 man page: -oN/-oX/-oS/-oG : Output scan in normal, XML, s| Show Sample Output


    6
    nmap -v -sP 192.168.0.0/16 10.0.0.0/8
    anapsix · 2010-07-14 19:53:02 0

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Convert entire audio library in parallel
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Show what PID is listening on port 80 on Linux

RDP through SSH tunnel
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Find the package that installed a command

Given process ID print its environment variables
Same as previous but compatible with BSD/IPSO

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Multi-thread any command
For instance: $ find . -type f -name '*.wav' -print0 |xargs -0 -P 3 -n 1 flac -V8 will encode all .wav files into FLAC in parallel. Explanation of xargs flags: -P [max-procs]: Max number of invocations to run at once. Set to 0 to run all at once [potentially dangerous re: excessive RAM usage]. -n [max-args]: Max number of arguments from the list to send to each invocation. -0: Stdin is a null-terminated list. I use xargs to build parallel-processing frameworks into my scripts like the one here: http://pastebin.com/1GvcifYa

Access to specific man page section
You can view the man pages from section five by passing the section number as an argument to the man command

Perl Command Line Interpreter
Can also just use the debug mode like this.

Copy ssh keys to user@host to enable password-less ssh logins.
Alternative for machines without ssh-copy-id

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