I want to do multiple replaces in one line with the ed editor in Linux in the following file:
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
#
#/dev/dsk/c0d0s2 /dev/rdsk/c0d0s2 /usr ufs 1 yes -
fd - /dev/fd fd - no -
/proc - /proc proc - no -
/dev/dsk/c0d0s3 - - swap - no -
/dev/dsk/c0d0s0 /dev/rdsk/c0d0s0 / ufs 1 no -
/dev/dsk/c0d0s4 /dev/rdsk/c0d0s4 /usr ufs 1 no -
/dev/dsk/c0d0s1 /dev/rdsk/c0d0s1 /var ufs 1 yes -
/dev/dsk/c0d0s7 /dev/rdsk/c0d0s7 /export ufs 2 yes -
/dev/dsk/c0d0s5 /dev/rdsk/c0d0s5 /usr/informix ufs 2 yes -
swap - /tmp tmpfs - yes -
I want to swap all "c0" with "c1" in /dev/....
Here is my regex which I put into ed: 1,\$s/\(\/dev.*\)\(c0\)\(d0s.*\)/\1c1\3/g which results in
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
#
#/dev/dsk/c0d0s2 /dev/rdsk/c1d0s2 /usr ufs 1 yes -
fd - /dev/fd fd - no -
/proc - /proc proc - no -
/dev/dsk/c1d0s3 - - swap - no -
/dev/dsk/c0d0s0 /dev/rdsk/c1d0s0 / ufs 1 no -
/dev/dsk/c0d0s4 /dev/rdsk/c1d0s4 /usr ufs 1 no -
/dev/dsk/c0d0s1 /dev/rdsk/c1d0s1 /var ufs 1 yes -
/dev/dsk/c0d0s7 /dev/rdsk/c1d0s7 /export ufs 2 yes -
/dev/dsk/c0d0s5 /dev/rdsk/c1d0s5 /usr/informix ufs 2 yes -
swap - /tmp tmpfs - yes -
However, this long regex:
1,\$s/\(\/dev.*\)\(c0\)\(d0s.*\)\(\/dev.*\)\(c0\)\(d0s.*\)/\1c1\3\4c1\6/g results in this:
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
#
#/dev/dsk/c1d0s2 /dev/rdsk/c1d0s2 /usr ufs 1 yes -
fd - /dev/fd fd - no -
/proc - /proc proc - no -
/dev/dsk/c0d0s3 - - swap - no -
/dev/dsk/c1d0s0 /dev/rdsk/c1d0s0 / ufs 1 no -
/dev/dsk/c1d0s4 /dev/rdsk/c1d0s4 /usr ufs 1 no -
/dev/dsk/c1d0s1 /dev/rdsk/c1d0s1 /var ufs 1 yes -
/dev/dsk/c1d0s7 /dev/rdsk/c1d0s7 /export ufs 2 yes -
/dev/dsk/c1d0s5 /dev/rdsk/c1d0s5 /usr/informix ufs 2 yes -
swap - /tmp tmpfs - yes -
leaving the first "c0" still as "c0" because it's not found by the search string
So I got a file where I got multiple search results in one line but it only replaces one instance. I know that the "global"-Flag runs in the first step through the file and marks the matching line. I hope I know what causes the problem but i don't have enough experience with the ed to know how to fix it.
Cheers for you help
You can use the g command to search lines with the dev string then replace globally using the s (substitute) command and the g (global) flag :
g/\/dev/s/c0/c1/g
giving you the expected result:
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
#
#/dev/dsk/c1d0s2 /dev/rdsk/c1d0s2 /usr ufs 1 yes -
fd - /dev/fd fd - no -
/proc - /proc proc - no -
/dev/dsk/c1d0s3 - - swap - no -
/dev/dsk/c1d0s0 /dev/rdsk/c1d0s0 / ufs 1 no -
/dev/dsk/c1d0s4 /dev/rdsk/c1d0s4 /usr ufs 1 no -
/dev/dsk/c1d0s1 /dev/rdsk/c1d0s1 /var ufs 1 yes -
/dev/dsk/c1d0s7 /dev/rdsk/c1d0s7 /export ufs 2 yes -
/dev/dsk/c1d0s5 /dev/rdsk/c1d0s5 /usr/informix ufs 2 yes -
swap - /tmp tmpfs - yes -