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AWK Script Issue insert newline for a regular expression match

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Top Forums Shell Programming and Scripting AWK Script Issue insert newline for a regular expression match
# 36  
Old 12-02-2010
Code:
# cat in3
pin RXA {
input
output
}

pin RXTRY {
input
output
}
pin TXCRY {
input
output
}
pin BXDRY {
input
output
}
pin MTRE {
input
output
}

pin RXF {
input
output
}
# awk '/RXA/{f=1}(f==1)&&/^$/{f=2}/RXF/{f=0;printf RS}(f!=2)' in3
pin RXA {
input
output
}

pin RXF {
input
output
}
# tr '{}' '[]' <in3 >in4
# awk '/RXA/{f=1}(f==1)&&/^$/{f=2}/RXF/{f=0;printf RS}(f!=2)' in4
pin RXA [
input
output
]

pin RXF [
input
output
]
#

If your file doesn't contains empty line so that the block are delimited by a line like }... you can also use } instead of blank line :

Code:
# awk '/RXA/{f=1}(f==1)&&/^}$/{f=2}/RXF/{f=0;printf "}"RS}(f!=2)' in3
pin RXA {
input
output
}
pin RXF {
input
output
}

Code:
# awk '/RXA/{f=1}(f==1)&&/^]$/{f=2}/RXF/{f=0;printf "]"RS}(f!=2)' in4
pin RXA [
input
output
]
pin RXF [
input
output
]
#

Last edited by ctsgnb; 12-02-2010 at 10:44 AM..
This User Gave Thanks to ctsgnb For This Post:
jaita
# 37  
Old 12-02-2010
Network awk script issue
Thanks Ctgsnb for your reply !

Can u explain me the Frankiln's and ur code as well and
the query I raised for the Franklin's Code in my previous post

Thanks
Jaita
# 38  
Old 12-02-2010
Quote:
Originally Posted by jaita
Reframing the code again

Code:
 
pin RXA {
input 
output 
}

pin RXTRY {
input 
output 
}
pin TXCRY {
input 
output 
}
pin BXDRY {
input 
output 
}
pin MTRE {
input 
output 
}

pin RXF {
input 
output 
}

Matching the regular expression from range RXTRY to MTRE and delete the blocks

Output

Code:
 
pin RXA {
input 
output 
}

pin RXF {
input 
output 
}

Code:
awk '/RXTRY|MTRE/{_++} /}/ && !(_-2) {_=x;next}!_' file

Last edited by danmero; 12-02-2010 at 03:08 PM..
# 39  
Old 12-02-2010
Franklin has already explained his code : check post #27

Here are some explainations about mine

/RXA/{f=1}for any lines , if matching RXA set a flag f=1
(f==1)&&/^}$/{f=2}for any lines, if the f is set to 1 and match the regular expression ^}$ then set flag to f=2
/RXF/{f=0;printf "}"RS}for any lines, if lines match regex RXF then set flag to 0 and reprint a } followed by the Record Separator (its default value is "\n")
(f!=2)for any lines, if the flag is not equal to 2, print the line
Note that if you have trailing space before and/or after } you can change the reg ex ^}$ to ^ *} *$
Last edited by ctsgnb; 12-02-2010 at 04:33 PM..
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