Gentoo-Upgrade/sbin/kernel-clean.sh

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#!/bin/bash
NICE_CMD="nice -n 19 ionice -c2"
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REVISION=`kernel-config list | grep \*$ | cut -d" " -f6 | cut -d- -f2-8`
[ "" == "$REVISION" ] && echo "No appropriate kernel revision found ;-(" && exit -1
SOURCES=linux-$REVISION
[ "" == "$SOURCES" ] && echo "No appropriate kernel sources found ;-(" && exit -1
# rm old modules
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cd /lib/modules && $NICE_CMD rm -rf `ls | grep -v "^$REVISION$"`
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# rm old kernel revisions
mount -o remount,rw /boot
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cd /boot && rm -f `ls System.map-* config-* vmlinuz-* initramfs-* 2>/dev/null | grep -vE "$REVISION$|$REVISION.img$"`
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mount -o remount,ro /boot
# rm old sources
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cd /usr/src && $NICE_CMD rm -rf `find -maxdepth 1 -name "linux-*" -type d | grep -v "$SOURCES$"`
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exit 0