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Clearing Large Files

I have a couple methods to clear large files. First of all, if the files are repetitive, logrotate looks to be the best way to roll.

If not using logrotate though, here's a few methods I've found.

First, see how much space you have:

df -h

See the biggest files and folders:

see_biggest() {
    if [[ "$(uname)" == "Darwin" ]]; then
        # Macs don't have -h so we sort numerically
        du -ax ./* | sort -n | tail -n "${1-50}"
    elif [[ "$(expr substr $(uname -s) 1 5)" == "Linux" ]]; then
        # Do something under GNU/Linux platform
        du -ahx ./* | sort -h | tail -n "${1-50}"
    fi
}

I used the following command to erase the biggest files in a folder except the last two (which I wanted to deal with specially)

for file in $(see_biggest 10 | awk '{print $2}' | head -n-2); do \rm $file; done

This command erases files last modified over 6 months ago (this should probably be run with -exec echo {} + before jumping to the rm)

find -type f -mtime +180 -exec rm {} +

If I have a big file and I want to delete the first half of it, I use the following command:

#!/bin/bash

# script name: print_last_half.sh

set -eu

filename="$1"
[[ -z "$filename" ]] && echo "Need filename!" && exit
lines=$(wc -l "$filename" | awk '{print $1}')
last_lines=$(expr "$lines" / 2)
unset lines
tail -n "$last_lines" "$filename"
# Alternative from Andrew
`tail -n $(($(wc -l <filename> | cut -d ' ' -f 1) / 2)) <filename>`

Then use it like the following:

./print_last_half.sh filename.txt filename.txt.lasthalf
# make sure it looks good using `less`
mv filename.txt.lasthalf filename.txt
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