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#print
Sometimes you want to recognize a string of characters
only if they appear at the beginning of the line.
The character '^' is used for this purpose. The
command
s/^ab/xy/
will change "ab" to "xy" only if "ab" begins the line.
Try the following and watch what it does.
ed file
1,2p
1,2s/^ab/xy/
w
q
ready
#create Ref
xycd
abcd
#create file
abcd
abcd
#user
#cmp file Ref
#log
#next
38.2b 5
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