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Chage default shell for all users [FreeBSD]
This command will set bash as the default shell for all users in a FreeBSD system.

Safely remove old unused kernels in Ubuntu/Debian
Removes piling kernels from /boot, save the current one. This command DOES NOT remove the 'linux-image-generic' package, so you'll continue getting kernel updates

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

Download Youtube video with wget!
Nothing special required, just wget, sed & tr!

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

floating point operations in shell scripts
Calculator for shell. Similar performance and basic usage as 'bc', but with more advanced features. Not installed on most systems by default.

Mount folder/filesystem through SSH
Install SSHFS from http://fuse.sourceforge.net/sshfs.html Will allow you to mount a folder security over a network.

Backup trought SSH

list files recursively by size

Find usb device in realtime
Using this command you can track a moment when usb device was attached.


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