Commands by argherna

Commands by argherna (3)

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Encode/Decode text to/from Base64 on a Mac w/out Mac Ports

I have a mac, and do not want to install mac ports to get the base64 binary. Using openssl will do the trick just fine. Note, to decode base64, specify a '-d' after 'base64' in the command. Note also the files base64.decoded.txt and base64.encoded.txt are text files.
This is sample output - yours may be different.
3

openssl base64 -in base64.decoded.txt -out base64.encoded.txt

argherna · 2010-08-13 20:39:10 4
Remove an unnecessary suffix from a file name for all files in a directory

For this example, all files in the current directory that end in '.xml.skippy' will have the '.skippy' removed from their names.
This is sample output - yours may be different.
-2

for f in $(ls *.xml.skippy); do mv $f `echo $f | sed 's|.skippy||'`; done

argherna · 2009-11-19 21:36:26 21
Pipe ls output into less

This is useful for paging through long directories, mulitple directories, etc. I put this in my ~/.bash_aliases file and alias 'lsl' to it.
This is sample output - yours may be different.
-2

function lsless() { ls "$@" | less; }

argherna · 2009-11-13 17:28:06 8

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Find processes stuck in dreaded "D" state aka IO Wait

Lots of fun to run on nfs clients when the server or network connection is having issues

Execute a command with a timeout

In this example the command "somecommand" will be executed and sent a SIGALARM signal if it runs for more than 10 seconds. It uses the perl alarm function. It's not 100% accurate on timing, but close enough. I found this really useful when executing scripts and commands that I knew might hang E.g. ones that connect to services that might not be running. Importantly this can be used within a sequential script. The command will not release control until either the command completes or the timeout is hit.

shutdown pc in a 4 hours

you may as well use shutdown -h 18:32 to shutdown your machine at 18:32.

What is my public IP-address?

Short command, easy to remember

Octal ls

Do ls with permissions written in octal form.

diff current vi buffer edits against original file

Use acpi and notify-send to report current temperature every five minutes.

Use acpi and notify-send to report current temperature every five minutes. Works best in a shell script run at startup. acpi is called for temperature and fed to notify-send for a tooltip. After waiting five minutes, it will start over.

split a multi-page PDF into separate files

Have to do this once per output file, because if device is 'pdfwrite', even if 'gs' sees '%d' in the OutputFile it still only creates one single output file. Embed it into a simple shell script if you want to split a document out into one file for every page.

Output Detailed Process Tree for any User

An easy function to get a process tree listing (very detailed) for all the processes of any gived user. This function is also in my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

the executable that started the currently running oracle databases and the ORACLE_HOME relative to each

get a list of currently running oracle dbs (identified by the pmon process) show the executable that spawned the process and show the ORACLE_HOME relative to the environment within which the process is running tailored to AIX (sed on linux behaves...differently) suggestions for a better way...please.

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