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You may try this:
awk -F, 'FNR==NR{
if(NR>1) a[$1]=$0
next}
{if(FNR==1) next
$2 = ($2 in a ? a[$2] : "NOT FOUND") }
1' OFS=, file2.csv file1.csv

Try:
perl -lne 'push @w, /\bA(?:BC|DF)_\w+/g; END{ print join ", ", @w if @w}' ABC.txt

/\(.\)\1/!d :
For all lines not matching the pattern, delete the pattern space. The ! is for the pattern and not for the action d. This means that for all lines not having at least 1 consecutive...

A different type of Perl alternative (if you are interested):
perl -lpe '@a = split /(:)/, $_, -1; @a = map { ($_+1)%4 ? $a[$_] : "|" } 0..$#a if @a>3;
$_ = join("",@a)' file
This could be easily...

Did you read my post carefully? I said tr -d '\0' < inputfile and not what you tried.

And, ^@ is the ASCII representation of the null character (in caret notation).

Try using nawk instead of awk.
Seems like the Solaris awk is accepting only a single-character FS.

You seem to be using ksh88, not ksh93.
Try:

for i in ab.name.*
do
new=$(echo "$i"|sed 's/^ab/BOX/;s/\./_/g')
echo mv "$i" "$new"
done

Hi Don, may be you didn't read MadeInGermany's reply carefully (or may be it was not well explained). I think he meant that $3=="" is equivalent to $3~/^$/ (the 2nd code fragment in his post).

What if the last field is the one to be excluded from the output?

Why use cat at all? Use the shell itself geo=$(<geom.txt).

May be:
sed '/^#/!s/Test/&1/g' file

You've badly messed up the command line and the logic.

Try:
perl -i.old -ne 'print unless m:^\s*<string>com\.apple\.PhotoBooth</string>\s*$:' ~/Library/Compositions/Compound\ Eye.qtz

I...

Assuming ASCII data, try
perl -F, -lape 'BEGIN { ($tmpl = shift) =~ s/(\d+)/A$1/g }
$_ = pack($tmpl, @F)' "$COLUMNS" "$indir/input_file.dat" > "$outdir/output_file.dat"

That is incorrect. Check manual page for gawk.

@OP:
Check this:
gawk 'BEGIN{
field1="Sdddddfffffggggg"
split(field1,array,"")
print "Pattern : [" array[1] "]"
print "Field 1 :[" field1 "]"...

If you need the functionality of nohup, you could set a trap for SIGHUP to ignore it and ensure required redirections.

In bash, the piped processes run in sub-shells. So, the second exit 1 is only affecting the sub-shell running the while loop and not your whole script.

Try a variant such as:
...
while read i;...

Technically, the -> is a binary infix dereference operator. In your case, since the right side of the operator is neither an array/hash subscript nor a subroutine argument list, it implies a method...

Check the delimiters for substitution.

Use nawk on Solaris.

Better to use $1 instead of $0 to avoid skipping some duplicate numbers due to leading/trailing whitespace.

In awk, systemreturns the exit status of the command and not its standard output (unlike command substitution a.k.a. backticks). So, in your case, date will write to standard output wherever that is...

In these kinds of fora, others can judge your level of understanding only through what you mention in your posts; rarely anyone knows anybody else personally to make any appropriate presumptions....

Assuming that your dates are valid:
perl -MTime::Local=timelocal_nocheck -F/ -lape '$_ .= " --> " . (
timelocal_nocheck(0,0,0,$F[1],$F[0]-1,$F[2]-1900) - timelocal_nocheck(0,0,0,(localtime)[3,4,5])...

awk -F, '{split($4,a,/\//);$4=sprintf("%02d/%02d/%s",a[1],a[2],a[3])}1' OFS=, file
@Yoda, that's assuming that the first 3 comma-separated fields never have any slashes.
And still its a broken...

Sweet...