dd - convert and copy a file
To backup the entire harddisk
$ dd if=/dev/sdc of=/dev/sdd
To create an image of a Hard Disk
$ dd if=/dev/hdb of=~/hdbdisk.img
To restore using the Hard Disk Image
$ dd if=hdcdisk.img of=/dev/hdd
To create a compressed disk image
$ dd if=/dev/sdb | gzip -c >/tmp/sdbdisk.img.gz
Backup a partition to another
$ dd if=/dev/sdb1 of=/dev/sdc1 bs=4096 conv=noerror,sync
To restore a disk or a partition image
$ dd if=/tmp/sdbdisk.img of=/dev/sdb
To restore compressed image
$ gzip -dc /tmp/sdcdisk.img.gz | dd of=/dev/sdc
To convert case of a file
$ cat file1
abcdefgh
$ dd if=~/file1 of=~/file2 conv=ucase
$ cat file2
ABCDEFGH
$ dd if=~/file2 of=~/file3 conv=lcase
regards,
T.Dhanasekar
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