Useful AWK scripting commands

AWK SCRIPTING



Adding sth to a file


$NF is the value of the last field in the line in awk , $NF-1 is the last but one field


$0 is the entire line



grep PIN FB_041509_newpins.lef
awk '{print $2 "()"}'   this command greps all lines with PIN and
selects $2 only and writes to new file and adds () after $2 in every line


awk '{print $2 "()"}




awk '/PIN/ {print $1 $2}' filename ==> prints the output with $1 and $2 values side by side w/o any space




awk '/PIN/ {print $1,$2}' filename ==> prints the output with $1 and $2 values side by side with space
OR


awk '/PIN/ {print $1 " " $2}' filename ==> prints the output with $1 and $2 values side by side with space




awk '/foo/ { print $0 }' /etc/passwd this is command searches for foo in file passwd and prints the entire line having foo



awk '/start/, /stop/' file # Print all lines between start/stop pairs (not working)




awk '{print ; print ""}' FB_041509_newpins.lef to include line spaces between lines in a file




{ printf("The sum on line %d is %.0f.\n", NR, $1+$2) } in awk




awk '{ printf("the port of FB of %d is %f \n", NR, $2) }' FB_041509_newpins.lef



NR is the number of lines print NF prints all the line nos one by one in file


NF is the no of fields in a line and (print NF) prints all the fields of each line one by one




awk '/PIN/ {print $1; print $2}' FB_041509_newpins.lef prints $1 in one line and $2 in next line






awk '$1~/^C/' test.sp line beginning with C




PIN vcc after grep or search for PIN (the same line having PIN)


PIN vdd


OUTPUT is like this


PIN


vcc


PIN


vdd






awk '{print "-" " "$1 " " "il_biobuf_assp" " " "+" " " "PLACED" " " "(" " " $2 " "$3 " " ")" " " "S" }' newpadfile > compfile






awk '{print ; print " " ";"}' compfile > compfile_total ==> this command inserts ; in the every nextline of file compfile



egrep "Layout Primary Cell:

TOTAL DRC Results Generated:" oan211d2.report
awk '{ cell = $NF;getline;print cell,$(NF-1),$NF;}'


==============AWK GETLINE=================


AWK getline is important and used when we want to print the output by operating on more than one line




awk '{cell = $NF; getline;name = $4; getline;print cell,name,$3}' testfile ==> this command reads NF, $4 and $3 words from three different lines of the file testfile


IN the above command getline will get the next line in the file


awk '{ cell = $NF;getline;print cell,$(NF-1),$NF;}'




=====================================VI COMMANDS===========================================