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Alternatively, in Perl, you could combine the beginning of line with a character class containing all the characters that could precede the redundant zero, like so:


$
$ perl -lne 's/(^|[...

Many sed versions have a "word boundary" anchor.
sed 's/\<0//g'Multiple leading zero's:
sed 's/\<0*\([0-9]\)/\1/g'or

awk '{ sub(/^0/, "")
gsub(/ 0/, " ")
gsub(/[|]0/, "|")
gsub("/0", "/")
gsub(":0", ":")
}
1' file
and with a POSIX conforming version of sed:
sed -e 's/^0//' -e 's,\([|/: ]\)0,\1,g' file
...

No awk needed:
while IFS=\| read V1 V2 V3 V4 REST; do [ ! "$V4" = "UPSTR" ] && continue; echo $V1, $V2, $V3; done < file
NOTE1, VALUE1, HMM
NOTE2, , HMP
NOTE3, VALUE3, HML
NOTE4, , HMD
NOTE5,...

Hello Joselouis,

If you want to do a check on a variable's value either it is NULL or not then -z checks if a variable is empty if block's value will be TRUE so either you could use your awk into...

Hello Joselouis,

Could you please try following and let me know if this helps you.

awk -vvar="$VAR" 'NR==1{print $0 var;next} 1' Input_file

Output will be as follows.

12-11-16|11 2016...