version           : check_your_awk version 0.1 (2011-12-04)
time              : 2011-12-04 15:49:29
uname             : Linux a-laptop 2.6.32-36-generic #79-Ubuntu SMP Tue Nov 8 22:29:26 UTC 2011 i686 GNU/Linux
nawk              : GNU Awk 3.1.6
gawk              : GNU Awk 3.1.6
mawk              : mawk 1.3.3 Nov 1996, Copyright (C) Michael D. Brennan
busybox           : BusyBox v1.13.3 (Ubuntu 1:1.13.3-1ubuntu11) multi-call binary
original-awk      : awk version 20091126


============================================
func
============================================
[code]
awk 'func a(){ print "hello" } BEGIN{ a() }'

[nawk]
hello

[gawk]
hello

[mawk]
mawk: line 2: function a never defined
mawk: line 2: function a never defined

[busybox]
hello

[original-awk]
hello


============================================
length()
============================================
[code]
awk 'BEGIN{ a[0]=1; a[1]=2; print length(a) }'

[nawk]
2

[gawk]
2

[mawk]
mawk: line 1: illegal reference to array a

[busybox]
0

[original-awk]
2


============================================
close()
============================================
[code]
awk 'BEGIN{ f="h9g7Tnw3"; while (getline s < f > 0) {print s;}; print "open done."; close(f); print "close done." }'

[nawk]
open done.
close done.

[gawk]
open done.
close done.

[mawk]
open done.
close done.

[busybox]
open done.
Segmentation fault

[original-awk]
open done.
close done.


============================================
regex character class
============================================
[code]
awk 'BEGIN{ s="a b"; if (s ~ /a[[:space:]]b/) {print s} else {print "unmatched"} }'

[nawk]
a b

[gawk]
a b

[mawk]
unmatched

[busybox]
a b

[original-awk]
a b


============================================
hyphen in regex 1
============================================
[code]
awk 'BEGIN{ s="a-b"; if(s ~ /a[a\-a]b/){print s} else {print "unmatched"} }'

[nawk]
a-b

[gawk]
a-b

[mawk]
a-b

[busybox]
awk: bad regex 'a[a\-a]b': Invalid range end

[original-awk]
a-b


============================================
hyphen in regex 2
============================================
[code]
awk 'BEGIN{ s="a-b"; if(s ~ /a[\#\-\#]b/){print s} else {print "unmatched"} }'

[nawk]
a-b

[gawk]
a-b

[mawk]
a-b

[busybox]
unmatched

[original-awk]
a-b


============================================
backslash in regex
============================================
[code]
awk 'BEGIN{ s="a(b)c"; if(s ~ "a\(b\)c"){print s} else {print "unmatched"} }'

[nawk]
nawk: warning: escape sequence `\(' treated as plain `('
nawk: warning: escape sequence `\)' treated as plain `)'
unmatched

[gawk]
gawk: warning: escape sequence `\(' treated as plain `('
gawk: warning: escape sequence `\)' treated as plain `)'
unmatched

[mawk]
a(b)c

[busybox]
unmatched

[original-awk]
unmatched


============================================
backslash in sub() and gsub()
============================================
[code]
awk 'BEGIN{ s="\\"; sub(/\\/, "\\\\", s); print s }'

[nawk]
\\

[gawk]
\\

[mawk]
\

[busybox]
\\

[original-awk]
\\


============================================
gsub()
============================================
[code]
awk 'BEGIN{ s="aaabbbccc"; gsub(/^[^b]*/, "", s); print s }'

[nawk]
bbbccc

[gawk]
bbbccc

[mawk]
bbb

[busybox]
bbbccc

[original-awk]
bbbccc


============================================
output null byte 1
============================================
[code]
awk 'BEGIN{ print "\0" }' | od -t x1 | head -1

[nawk]
0000000 00 0a

[gawk]
0000000 00 0a

[mawk]
0000000 0a

[busybox]
0000000 0a

[original-awk]
0000000 0a


============================================
output null byte 2
============================================
[code]
awk 'BEGIN{ printf "%c", "\0" }' | od -t x1 | head -1

[nawk]
0000000 00

[gawk]
0000000 00

[mawk]
0000000 00

[busybox]
0000000

[original-awk]
0000000


============================================
output null byte 3
============================================
[code]
awk 'BEGIN{ printf "%c", 0 }' | od -t x1 | head -1

[nawk]
0000000 00

[gawk]
0000000 00

[mawk]
0000000 00

[busybox]
0000000

[original-awk]
0000000 00


============================================
number or string
============================================
[code]
printf "%s" "a" | awk '{ s=$1; sub(/a/, "10", s); r = (s > 5) ? "true" : "false"; print r } '

[nawk]
true

[gawk]
true

[mawk]
false

[busybox]
false

[original-awk]
false