Bash – Adams Bros Blog

Linux Disk Usage Exclude Dot Directories

Trenton — Sun, 13 Dec 2015 21:26:36 +0000

I’m always searching for how to do this because I keep forgetting. So here it is, no more searching.

du -mcs /home/user/* /home/user/.[!.]* | sort -n

Backups Made Simple

Trenton — Mon, 31 Aug 2015 21:57:03 +0000

I’ve had complex backup solutions in the past, which I wrote myself with rsync and bash. I’ve recently got sick and tired of the issues that come up now and then with them, so I decided to keep it extremely simple. So, I decided to opt for a couple of rsync only shell scripts. I get emails every time they run, as part of cron.

So, the cronjobs look like this…

0 8-19 * * 1 /home/trenta/backup/monday-rsync.sh
0 8-19 * * 2-5 /home/trenta/backup/daily-rsync.sh

monday-rsync.sh…

#!/bin/bash
# /home/trenta/backup/monday-rsync.sh
/usr/bin/rsync -avH --exclude-from=/home/trenta/backup/daily-excludes.txt /home/trenta/ /media/backup/trenta-home/

daily-rsync.sh…

#!/bin/bash
# /home/trenta/backup/daily-rsync.sh
/usr/bin/rsync -avH --exclude-from=/home/trenta/backup/daily-excludes.txt --link-dest=/media/backup/trenta-home/ /home/trenta/ /media/backup/trenta-home-$(/bin/date +'%w')/

Save Bash History Realtime

Trenton — Wed, 19 Nov 2014 02:49:52 +0000

I kind of get sick of my work computer dying, and then I lose some history because I forgot to exit my terminal sessions. I’ve always used the histappend feature, but this prompt command thing is great. Thank you Stack Exchange. The other benefit of this is that each terminal immediately receives the new history next time you press enter.

shopt -s histappend # append to history, don't overwrite it
export PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"

Compress All Log Files

Trenton — Tue, 04 Nov 2014 18:26:44 +0000

I decided to start being more active with this blog. I’ve always wanted a personal indexer for all the things I learn in Linux or software development. Might as well make this blog that index.

So, you want to gzip all the log files in a particular directory right? Well, you better be sure that you’re not doing that to live files, so just check them with lsof…

find /var/log/somefolder -type f | while read -r file; do lsof "$file"; if [ $? -eq 1 ]; then gzip "$file"; fi; done

Removing spaces from filenames

Trenton — Mon, 14 Jun 2010 03:38:08 +0000

If you use bash under unix, Linux, or Mac OS X, and you’re continually forgetting how to convert filenames with spaces to filenames without spaces, then look no further.

I use dash (-) for the final space replacement, as it looks sharp IMO.

find ./ -name '* *' -type f -print0 | \
while IFS= read -r -d $'\0' file; do 
 echo "$file" "${file// /-}"; 
done

I figured if it takes me a few minutes each time to figure it out, it’s worth documenting. And, if it’s worth documenting, it’s worth sharing with others. I hope this was useful. If it is, please leave a comment.