Commands tagged beginner (12)

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

Unix alias for date command that lets you create timestamps in ISO 8601 format
I often need to add a timestamp to a file, but I never seem to remember the exact format string that has to be passed to the date command to get a compact datetime string like 20090220T231410 (i.e yyyymmddThhmmss, the ISO 8601 format popular outside the US)

Show top 50 running processes ordered by highest memory/cpu usage refreshing every 1s
http://alvinalexander.com/linux/unix-linux-process-memory-sort-ps-command-cpu for an overview of --sort available values

Hiding and Show files on Mac OS X
These commands will mark a file as hidden or visible to Mac OS X Finder. Notice the capitol V vs the lowercase v. This will also work for directories. setfile -a V foo.bar; // This marks the file invisible setfile -a v foo.bar; // This marks the file visible I have also found that adding the following aliases are helpful: alias hide='setfile -a V' alias show='setfile -a v'

Append last argument to last command
Just like "!$", except it does it instantly. Then you can hit enter if you want.

worse alternative to
worse alternative to ctrl+r: grep the history removing duplicates without sorting (case insensitive search).

To get the CPU temperature continuously on the desktop
There is no need for variables. I also added sleep to reduce cpu usage, however I didn't test it.

Create a bunch of dummy files for testing
Sometimes I need to create a directory of files to operate on to test out some commandlinefu I am cooking up. The main thing is the range ({1..N}) expansion.

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

Quickly generate an MD5 hash for a text string using OpenSSL


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