Category: Linux

Simple bash snippets, obscure config zen or an elaborate ssh-keygen command sequence are collected here.

Parents: Text, How-tos

How to manage multiple Git repositories with a simple bash function

In the past I have already worked with a project that consisted of multiple Git repositories in a common project folder. For tracking each repository’s individual state together, Google’s repo tool was used. I ended up using mostly its powerful repo forall subcommand to execute various bash or git commands over the whole or subset of those projects.

Now, I was faced with the same situation, but without repo already in place. Could I get some of that forall feeling back, but without installing that (relatively) giant tool? It turns out, 9 lines of bash give me most of what I missed:

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Bash: How to find all files modified on a certain day

The following bash function (e.g. stored in your ~/.bash_aliases) finds all files within a directory that was changed on a specific date. I use this to retroactively check on all my activities throughout a day. For code-related changes, a filtered git log certainly is better, but this includes file downloads, modified text documents in one search query, if aimed at my home directory.

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How to list subdirectories recursively with total size

Just a note to myself, as I always have a hard time understanding the find manpages. To list the directories and subdirectories up to a certain depth, “simply” enter:

find . -maxdepth 2 -type d

Option maxdepth states how deep the subdirectories should be listed, option type restricts output to directories (d).

If a directory listing including size is required, this much shorter snippet does the trick, using du (disk usage), the counterpart to the often-used df (disk free):

du -hd 1

Option h triggers human-readable output, replacing size byte count (5820) with SI prefixed numbers (5.8K), while d limits the recursion depth like before.