Commands tagged bash (821)

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Always tail/edit/grep the latest file in a directory of timestamped files
zsh only If you have this command in your history, you can always re-run it and have it reference the latest file. The glob matches all timestamped files and then the resulting array is sorted by modification time (m) and then the first element in the sorted array is chosen (the latest)

Check wireless link quality with dialog box
The variable WIRELESSINTERFACE indicates your wireless interface

Pick a random line from a file

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

Mount a temporary ram partition
For FreeBSD

Protect directory from an overzealous rm -rf *
-R Recursively change attributes of directories and their contents. +i to set the immutable bit to prevent even root from erasing or changing the contents of a file.

restore the contents of a deleted file for which a descriptor is still available
Note that the file at the given path will have the contents of the (still) deleted file, but it is a new file with a new node number; in other words, this restores the data, but it does not actually "undelete" the old file. I posted a function declaration encapsulating this functionality to http://www.reddit.com/r/programming/comments/7yx6f/how_to_undelete_any_open_deleted_file_in_linux/c07sqwe (please excuse the crap formatting).

list block devices
Shows all block devices in a tree with descruptions of what they are.

Search gpg keys from commandline

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"


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