Unix

backup a partition over network:

dd if=/dev/sda1 | gzip | ssh user@remote dd of=sda1_backup.gz

dd if=sda1_backup.gz | gzip -d | ssh user@remote dd of=/dev/sda1

Create dvd-set as backup:

mondoarchive -O -g -s 8600M -z -r -E "/var/spool/squid/" -N -d /dev/scd0

replace blanks in filenames with _:

for i in *; do mv "${i}" `echo ${i} | sed 's/ /_/g'`; done

fineprint some textfiles as postscript:

a2ps -1RE -s2 testfile.pl testfile.txt

creating a slackware-package:

tar -xzf source.tar.gz

cd source

./configure

make

make install DESTDIR=/root/build

cd /root/build

makepkg source-1.5-i386-1.tgz

installpkg source-1.5-i386-1.tgz

useful bootoptions:

Linux single

Linux panic=60 4

Linux root=/dev/hdc3

Linux hda=3649,255,63 hdd=cdrom

hda 30gb LBA mode

man bootparam

recovering partition table:

gpart -b FILENAME -W /dev/hda /dev/hda

e2fsck /dev/hda1
e2fsck: Attemp to read block from filesystem resulted in short read
e2fsck -b 32768 /dev/hda1
alternate superblocks are stored typical in 8193, 16384, 32768

cloning a bad disk:

dd if=/dev/hda of=/dev/hdb conv=noerror,sync

gnu.orgs ddrescue:

ddrescue --max-retries=-1 /dev/hda /dev/hdb