linux - mounting an image and editing a configuring file ( within file system)using bash shell script -


i need mount image file( .qcow2 file) , edit 1 of files in file system following content :

address     192.168.xxx.xxx/24 active  primary-dns   xx.x.64.20   dns-domain    xxxx.xxtest   static-route  xx1.xx.0/18 next-hop xxx.xxx.xxx.x   li-local-save

i wrote following automation code mounting .qcow2 file not sure editing file sed. please help.

#!/bin/bash mkdir mntpt modprobe nbd max_part=8 qemu-nbd --connect=/dev/nbd0 $pwd/$1 mount /dev/nbd0p1 mntpt sed -i "s/^\(address \).*/\1xxx.xxx.xxx/24 active/g" mntpt/bof.cfg sed -i "s/^\(primary-dns \).*/\1x1.64.20/g" mntpt/bof.cfg sed -i "s/^\(no \).*/\1li-local-save/g" mntpt/bof.cfg  qemu-nbd --disconnect /dev/nbd0 umount mntpt

writing 3 separate sed scripts when 1 seems wasteful , potentially problematic. separate commands newline or (in dialects) semicolon within sed script.

also, if string needs contain slashes, either need escape slashes in string, or use different delimiter. can use s:foo:bar: synonym of s/foo/bar/ (with nonalphabetic, nonnumeric character instead of slash, really).

sed -i 's:^\(address \).*:\1xxx.xxx.xxx/24 active:         s/^\(primary-dns \).*/\1x1.64.20/         s/^\(no \).*/\1li-local-save/' mntpt/bof.cfg

(as far can tell, /g flag had superfluous. if need replace same value multiple times on same line, add on.)


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