Let’s say you have a huge text file with couple million lines. Now you want to split it up into 100, 200, or 300 line files. Bash makes it pretty easy with split.
In Bash:
split -l 500 file.txt
That splits up the file file.txt into 500 line chunks. What is produced are files such as xaa, xab, xac and so on.
Be sure to do man split for more options.
Sometimes it’s very useful to know how much content is in a directory without opening a GUI interface.
In Bash:
du -cks * | sort -n | awk '\''BEGIN { split("KB,MB,GB,TB", Units, ","); } { u = 1;while ($1 >= 1024){$1 = $1 / 1024;u += 1;}$1 = sprintf("%.1f %s", $1, Units[u]);print $0;}'\'' | tail -11
I would suggest adding this to your bash aliases as ducks.
Output looks something like so:
~ > ducks 4.0 KB p 72.0 KB Music 24.1 MB Sites 35.0 MB Downloads 433.3 MB Dropbox 937.5 MB Movies 3.5 GB Library 6.3 GB Desktop 11.7 GB Documents 16.5 GB Pictures 39.5 GB total ~ > _
Update: My good friend Clayton suggested a much simpler way. The only problem is that the output is not sorted.
du -h -d 1
The output is the whole directory. I truncated the output to show the last 11.
~ > du -h -d 1 | tail -11 6.3G ./Desktop 12G ./Documents 212M ./Downloads 433M ./Dropbox 3.6G ./Library 8.0K ./Movies 72K ./Music 17G ./Pictures 0B ./Public 24M ./Sites 40G . ~ >
Update #2: Some systems do not accept the -d flag. This can be replaced with the --max-depth flag, like so:
du -h --max-depth 1
Sure you can load up a bulky editor and use its tools to do that, but why not do it in much faster in bash with awk.
In Bash:
awk '!x[$0]++' in.txt > out.txt
Wasn’t that easy?
This is a quick one liner to find and replace strings in *nix. You can use this in your Mac terminal or Unix prompt.
In Bash:
find ./ -type f -exec sed -i 's/FIND/REPLACE/g' {} \;
Example:
find ./ -type f -exec sed -i 's/signin/login/g' {} \;
