Name
awk
awk 'instructions
'files
awk -fscript files
The awk script contained in instructions
or script
should be a series of /
pattern
/ {
action
}
pairs. The action
code is applied to each line matched by pattern
. awk also supplies several functions for pattern matching.
Functions
match(
text
,pattern
)
If
pattern
matches intext
, return the position intext
where the match starts. A failed match returns zero. A successful match also sets the variableRSTART
to the position where the match started, and the variableRLENGTH
to the number of characters in the match.gsub(
pattern
,replacement
,text
)
Substitute each match of
pattern
intext
withreplacement
, and return the number of substitutions. Defaults to$0
iftext
is not supplied.sub(
pattern
,replacement
,text
)
Substitute first match of
pattern
intext
withreplacement
. A successful substitution returns 1, and an unsuccessful substitution returns 0. Defaults to$0
iftext
is not supplied.
Example
Create an awk file and then run it from the command line.
$cat sub.awk
{ gsub(/https?:\/\/[a-z_.\\w\/\\#~:?+=&;%@!-]*/, "<a href=\"\&\">\&</a>"); print } $echo "Check the web site, http://www.oreilly.com/ catalog/repr" | awk -f sub.awk
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