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case command inside awk/nawk


 
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# 1  
Old 12-13-2007
case command inside awk/nawk

well I found lot of topics about awk..about if command in awk..

but I had to implement this:

nawk -F"|" '
$47 ~ /0R0011/ { print > ("/home/user/M/MC.tmp" )}
$47 ~ /0R0012/ { print > ("/home/user/M/DuSI.tmp" )}
$47 ~ /0R0014/ { print > ("/home/user/M/FF.tmp" )}
$47 ~ /0R0018/ { print > ("/home/user/M/Cg.tmp" )}
$47 ~ /0R0010/ { print > ("/home/user/M/M1.tmp" )} ' File0


basicly I did it with if command

nawk -F "|" '
{
if ($47=="0R0011")
{
print $0 ; }
} ' File0 > MC.tmp

but for one case only ..is there some kind of case/switch command inside awk/nawk..??

thanks a lot
# 2  
Old 12-13-2007
no, there's not. but you can emulate it.
gawk 3.1.3+ does support switch/case though.

Last edited by vgersh99; 12-13-2007 at 10:44 AM..
# 3  
Old 12-13-2007
Edit: Just saw you use ~ and not == so the solution I posted won't work ...

You could write something like this (for consecutive numeric values you
can use split to avoid assigning explicitly the array indexes/elements)

Code:
awk 'NR == 1 {
	p = "0R00"
	h = "/home/user/M/"
	e = ".tmp"
	u[p 10] = "M1"
	u[p 11] = "MC"
	u[p 12] = "DuSI"
	u[p 14] = "FF"
	u[p 18] = "Cg"
}
$47 in u {
	print > (h u[$47] e)
}' FS="|" data

Or you can try to build your GNU Awk (>= gawk 3.1.3)
with the --enable-switch option (just found it and I've never used it)
and try the switch statement:

Quote:
switch (expression ) {
case value or regular expression :
case-body
default:
default-body
}

Last edited by radoulov; 12-13-2007 at 10:55 AM..
# 4  
Old 12-13-2007
that is what I thought...there is no case or switch statement inside awk/nawk...

any suggestion how can I emulate it..or how can I do it without case/switch with supported statements
# 5  
Old 12-13-2007
Quote:
Originally Posted by abdulaziz
that is what I thought...there is no case or switch statement inside awk/nawk...

any suggestion how can I emulate it..or how can I do it without case/switch with supported statements
You already did it, no?
You want to type less? Smilie


Code:
nawk -F"|" '
$47 ~ /0R0011/ { print > ("/home/user/M/MC.tmp" )}
$47 ~ /0R0012/ { print > ("/home/user/M/DuSI.tmp" )}
$47 ~ /0R0014/ { print > ("/home/user/M/FF.tmp" )}
$47 ~ /0R0018/ { print > ("/home/user/M/Cg.tmp" )}
$47 ~ /0R0010/ { print > ("/home/user/M/M1.tmp" )} ' File0

# 6  
Old 12-13-2007
well yes I did it but when I look at it I just know that there is more elegant way...Smilie


but anyways thanks for answer that there is no case in awk..I thought that is must be becouse "if else" statement is supported..

i also tryed with

if () {

..}
else
{ if () {
..}
else {..}
}

but this is not working as well..
sorry for beeng boring..but I am courious..Smilie
# 7  
Old 12-13-2007
Quote:
Originally Posted by abdulaziz
well yes I did it but when I look at it I just know that there is more elegant way...Smilie


but anyways thanks for answer that there is no case in awk..I thought that is must be becouse "if else" statement is supported..
No, it's got nothing to do with 'if/else'. Other (most) languages support both, but not awk.
Once again, radoulov's shown one (elegant) way of emulating switch/case for your particular tasks - you might find it useful to adopt.
Quote:
Originally Posted by abdulaziz
i also tryed with

if () {

..}
else
{ if () {
..}
else {..}
}

but this is not working as well..
sorry for beeng boring..but I am courious..Smilie
not sure if it's the entire script, but it seems like you have an unbalanced '}'. What exactly 'not working'?

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