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Selecting a random file/folder of a folder
Also looks in subfolders

Remove newlines from output
?Cat and grep? You can use only grep ("grep \. filename"). Better option is awk.

Refresh the cache of font directory
Refresh the cache of font directory , usefull after you download font (.ttf or other) from various website and you don't want to reboot or relogin . Close your word processor before using the command , after the refresh reopen your word processor , new fonts is avaible !

Best SSH options for X11 forwarding
grabbed from: http://blog.samat.org/2006/05/08/best-ssh-options-for-x11-forwarding

Silently deletes lines containing a specific string in a bunch of files
This command will find all occurrences of one or more patterns in a collection of files and will delete every line matching the patterns in every file

Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Find the package that installed a command

listen to an offensive fortune
or replace "espeak" with "festival --tts" if you like festival better when your buddy leaves his computer unlocked use "crontab" or "at" to play at some time that would be most embarassing (during his next sales presentation) $ echo "fortune -o | espeak" | at now + 30 minutes of course you can exclude the "-o" for non offensive fortunes, or if you don't have offensive fortunes installed

Fast file backup
This is a BASH feature. The above command will create a backup of "filename" called "filename.DATE", where DATE is the actual day in %Y%m%d (year, month and day numbers together) format.

command line calculator
simple function , floating point number is supported.


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