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Matching options from ARGV in awk

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# 1  
Old 11-18-2011
Matching options from ARGV in awk
I have written this code in an awk script.



Code:
BEGIN {
  print "ARGV[ARGC-1]", ARGV[ARGC-1]
  if ( match(ARGV[ARGC-1],/-u/) || match(ARGV[ARGC-1],/--usg/) ) {
    print "MATCH -u:",match(ARGV[ARGC-1],/-u/), RSTART, RLENGTH
    print "MATCH --usg:",match(ARGV[ARGC-1],/--usg/), RSTART, RLENGTH
    usage()
    exit(1)
  }
}

I want to call the function usage when I use the following

Code:
awk -f ./addNoise-dat.awk -e
awk -f ./addNoise-dat.awk --examples

However, when I write the below I am still getting the function examples being called. It is because I have included it in a pattern. How can I only check for -e or --examples from the argument list to awk?

Code:
awk -f ./addNoise-dat.awk --exapls

# 2  
Old 11-18-2011
Then match the exact string "-e" or "-examples"...instead of matching on some regular expression pattern.
# 3  
Old 11-18-2011
/-e/ matches both "-e" and "--example"

Code:
/^-e$/  and /^--example$/

are probably what you want to use as your regex
# 4  
Old 11-18-2011
I have tried using the code below, but when I run

Code:
awk -f ./addNoise-dat.awk --exapls

I am getting

Code:
MATCH -e: 2 2 2
MATCH --examples: 0 0 -1

Seems it is matching on -e

Code:
  if ( match(ARGV[ARGC-1],"-e") || match(ARGV[ARGC-1],"--examples") ) {
    print "MATCH -e:",match(ARGV[ARGC-1],"-e"), RSTART, RLENGTH
    print "MATCH --examples:",match(ARGV[ARGC-1],"--examples"), RSTART, RLENGTH
    examples()
    exit(1)
  }

---------- Post updated at 10:21 AM ---------- Previous update was at 10:13 AM ----------

Yes, when I use as mentioned, things are fine.

Is there any way I can group /^-e$/ and /^--examples$/ with | inside match?

Code:
if ( match(ARGV[ARGC-1],/^-e$/) || match(ARGV[ARGC-1],/^--examples$/) )

# 5  
Old 11-18-2011
Your "if" is incorrect because as it is now it will always match whether string is "e" or "examples" or "exapls" so either anchor the strings or do it in two steps...
Code:
if ( match(ARGV[ARGC-1],"^--e$") || match(ARGV[ARGC-1],"^--examples$") ) {
    print "MATCH -e:",match(ARGV[ARGC-1],"-e"), RSTART, RLENGTH
    print "MATCH --examples:",match(ARGV[ARGC-1],"--examples"), RSTART, RLENGTH
    examples()
    exit(1)
  }

Btw i dont know if you can use regexp inside the match function...
# 6  
Old 11-18-2011
Quote:
Originally Posted by kristinu
Is there any way I can group /^-e$/ and /^--examples$/ with | inside match?
Code:
match (ARGV[ARGC-1], /(^-e$|^--examples$)/)

# 7  
Old 11-18-2011
This seems to work

Code:
  if ( match(ARGV[ARGC-1],/^-e$|^--examples$/) ) {
    print "MATCH -e:",match(ARGV[ARGC-1],/^-e$/), RSTART, RLENGTH
    print "MATCH --examples:",match(ARGV[ARGC-1],/^--examples$/), RSTART, RLENGTH
    examples()
    exit(1)
  }

Now, if I write something like

Code:
awk -f ./addNoise-dat.awk --expl

I get

Code:
awk: ./addNoise-dat.awk:221: fatal: cannot open file `--expl' for reading (No such file or directory)

Any idea how I can get awk to output an error if I enter -something or --something and something does not match -e or --examples. This should only happen if the first character starts with -
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