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Find last reboot time
Specific to OSX.

zsh only: access a file when you don't know the path, if it is in PATH
Say you want to execute 'file' on the command 'top' (to determine what type of file it is); but you don't know where 'top' resides: preface the argument with = and zsh will implicitly prepend the path.

your terminal sings
you know the song... sing along

Copy your SSH public key on a remote machine for passwordless login.
Should run on any system with ssh installed.

Get absolut path to your bash-script
Another way of doing it that's a bit clearer. I'm a fan of readable code.

Install pip with Proxy
Installs pip packages defining a proxy

get the oldest file in a directory
reverse the sorting of ls to get the newest file: $ls -1tr --group-directories-first /path/to/dir/ | tail -n 1 Problems: If there are no files in the directory you will get a directory or nothing.

Remove trailing space in vi

Rename all (jpg) files written as 3 number in 4 numbers.
Useful if you have a list of images called 1 2 3 4 and so on, you can adapt it to rewrite it as 4 (in this example) 0-padded number.

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


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