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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Sort files in folders alphabetically
Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

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

Youtube-dl gone stale on you/stopped working (Ubuntu)?
If you update youtube-dl from the repos, it becomes out-of-date quickly. Luckily, it can auto-update.

Find the package that installed a command

Find all files of a type and copy them elsewhere while keeping intact their full directory structure using find and cpio
.flac is the filetype. /Volumes/Music/FLAC is the destination.

Multiple SSH Tunnels
Thankfully, the ssh command allows you to specify multiple tunnels through the same server in one command. Remeber if you want a priviliged port on your machine, you must use root or sudo account.

Install pip with Proxy
Installs pip packages defining a proxy

Sort on multiple dis-contiguous keys/fields (can even specify key number/field from the end)
Notes: 1) -n-1 means sort key is the last field 2) -l is important if each separate record is on a new line (usually so for text files) 3) -j tells msort not to create log file (msort.log) in the working directory 4) may need to install msort package. 5) msort does lot more. Check man msort

print/scan lines starting at record ###
Useful for finding newly added lines to a file, tail + can be used to show only the lines starting at some offset. A syslog scanner would look at the file for the first time, then record the end_of_file record number using wc -l. Later (hours, days), scan only at the lines that were added since the last scan.

list files recursively by size


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