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Fill up disk space (for testing)
Put into some file. No special purpouse, just for fun...

FInd the 10 biggest files taking up disk space

Convert files from DOS line endings to UNIX line endings
Here "^M" is NOT "SHIFT+6" and "M". Type CTRL+V+M to get it instead. Its shortest and easy. And its sed!, which is available by default in all linux flavours.. no need to install extra tools like fromdos.

Get a diff of two json arrays
jq is amazing for manipulating json on the commandline, but the developers have some weird ideas about how to handle shell redirections. This command works around them. Further reading: https://github.com/stedolan/jq/issues/1110

Fetch the current human population of Earth
Fetches the world population JSON data from the US census and parses it uses jshon

Join a folder full of split files
If you use newsgroups then you'll have come across split files before. Joining together a whole batch of them can be a pain so this will do the whole folder in one.

find text in a file
this will find text in the directory you specify and give you line where it appears.

count how many times a string appears in a (source code) tree
grep -o puts each occurrence in a separate line

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.

Send an email from the terminal when job finishes
Sends an email from the terminal.


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