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Error in awk...

 
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# 1  
Old 04-02-2016
Error in awk...
Hi friends...
(Apoloigies for any typos.)
(Don, thanks for your input.)

Consider these two code snippets:-

awkerror1.awk
Code:
#!/usr/bin/awk -f
BEGIN \
{
	SAWTOOTHPLUS64 = " !#$&\'\)*,-/0235689:<>?ABDEGHJKMNPQSTVWYZ\\^_abdeghjkmnpqstvwyz|}~"
	for(LOOP = 1; LOOP <= 13; ++LOOP)
	{
		SAWTOOTHPLUS64 = SAWTOOTHPLUS64 SAWTOOTHPLUS64
	}
	printf("%s", SAWTOOTHPLUS64) > "/tmp/sawtoothplus64.raw"
}

awkerror2.awk
Code:
#!/bin/sh
awk 'BEGIN \
{
	SAWTOOTHPLUS64 = " !#$&"\'\)*,-/0235689:<>?ABDEGHJKMNPQSTVWYZ\\^_abdeghjkmnpqstvwyz|}~"
	for(LOOP = 1; LOOP <= 13; ++LOOP)
	{
		SAWTOOTHPLUS64 = SAWTOOTHPLUS64 SAWTOOTHPLUS64
	}
	printf("%s", SAWTOOTHPLUS64) > "/tmp/sawtoothplus64.raw"
}'

awkerror1.awk works perfectly.

awkerror2.awk gives this error:-
Code:
"""
./awkerror2.awk: line 9: unexpected EOF while looking for matching `"'
./awkerror2.awk: line 11: syntax error: unexpected end of file
"""

Last login: Sat Apr  2 07:52:50 on ttys000
AMIGA:barrywalker~> cd Desktop/Code/Awk
AMIGA:barrywalker~/Desktop/Code/Awk> ./awkerror1.awk
AMIGA:barrywalker~/Desktop/Code/Awk> ls -l /tmp/sawtoothplus64.raw
-rw-r--r--  1 barrywalker  wheel  524288  2 Apr 07:55 /tmp/sawtoothplus64.raw
AMIGA:barrywalker~/Desktop/Code/Awk> ./awkerror2.awk
./awkerror2.awk: line 9: unexpected EOF while looking for matching `"'
./awkerror2.awk: line 11: syntax error: unexpected end of file
AMIGA:barrywalker~/Desktop/Code/Awk> _

I have found out what is doing it, it is the ' inside the string, even escaping it does not cure the error, only removing it completely does.
I do not understand why a single quote, as part of a string inside double quotes, causes this error nor have I any idea how to cure it.
I have tried to get may amateur haed around it but unable to get it to work.
NOTE; this is more of curiosity as I am now using "#!/usr/bin/awk" for the script, but has "/bin/sh" or "awk" got a bug in parsing?

I await you guys knowledge...

TIA.
Last edited by wisecracker; 04-02-2016 at 04:27 AM..
# 2  
Old 04-02-2016
In the shell, double quote and backslash are regular characters inside a single quoted string. And, although single quote is not a special character inside a double quoted string, the single quote that is causing you problems is terminating a single-quoted string; not a single quote inside a double-quoted string in your awk script. The shell is seeing the single-quoted string:
Code:
'BEGIN \
{
	SAWTOOTHPLUS64 = " !#$&"\'

and both double quotes and single quotes are mismatched after that.

If you want a single quote for use inside a shell single-quoted awk script, define a variable outside the script and use the variable. For example:
Code:
#!/bin/sh
awk -v SQ="'" 'BEGIN \
{
	SAWTOOTHPLUS64 = " !#$&" SQ ")*,-/0235689:<>?ABDEGHJKMNPQSTVWYZ\\^_abdeghjkmnpqstvwyz|}~"
	for(LOOP = 1; LOOP <= 13; ++LOOP)
	{
		SAWTOOTHPLUS64 = SAWTOOTHPLUS64 SAWTOOTHPLUS64
	}
	printf("%s", SAWTOOTHPLUS64) > "/tmp/sawtoothplus64.raw"
}'

Note also that you don't need backslash escapes for the single quote and close parenthesis in the double-quoted string in awkerror1.awk (just as I dropped the backslash escape before the close parenthesis in the above adaptation of awkerror2.awk).
This User Gave Thanks to Don Cragun For This Post:
wisecracker
# 3  
Old 04-02-2016
Another technique is to split the ' ' into two parts and have a \' between them
Code:
echo 'part one'\''part two'

Actually, for a literal ' within ' ' it is enough to remember the escape sequence '\''
Code:
#!/bin/sh
awk 'BEGIN \
{
	SAWTOOTHPLUS64 = " !#$&'\'')*,-/0235689:<>?ABDEGHJKMNPQSTVWYZ\\^_abdeghjkmnpqstvwyz|}~"

This User Gave Thanks to MadeInGermany For This Post:
wisecracker
# 4  
Old 04-02-2016
Hi Don and MadeInGermany...

Where would I be without you guys on here...

Thanks, consider this thread solved...
 
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