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It's also important to realize that parallel can be a performance loss in some situations, especially if any of these queries are disk-intensive.

Please show your own work and any scripts / programs you have written so far to accomplish your task; and any error messages you got.

Nice pickup on the number of digits RadiC, must have miscounted there.

I'm fairly sure that -q will exit on first matching record so -m 1 will not add any more efficiency.

In Chubler_XL's proposal, 8 digits should be checked, and you could stop after the first invalid entry, saving some time on large files:if grep -qvEm 1 '^.{5}[0-9]{8}' inputfile.txt

If you are reading the file in line by line in a loop, you could add this type of thing too:-i=0
while read col1 col2 col3 col4 col5
do
((i=$i+1))
if [ "${#col3}" -ne 8 ]
then
...

Not sure what output you are after. Here I report if file contains any invalid rows:

if grep -qvE '^.{5}[0-9]{6}' inputfile.txt
then
echo "File is invalid"
else
echo "File is valid or...

OK. Why didn't you specify that in the first place?

Try sed 's/./&,/18;s/./&,/9;s/./&,/4;s/ *,/,/g' file

GNU awk:
awk '{sub(/ *$/,x,$5); print $1,$3,$5,$7}' FIELDWIDTHS="1 3 4 1 8 1 3" OFS=, file

I,0515,MR,394
I,0618,MR & MRS,942
I,0618,MR & MRS,944
I,0205,MR & MRS,614
I,0122,MR,940

Try sed 's/./,/4;s/./,/9;s/./,/18;s/ *,/,/g' file
I,0515,MR,394
I,0618,MR & MRS,942
I,0618,MR & MRS,944
I,0205,MR & MRS,614
I,0122,MR,940

How about using awk instead?
awk '{print substr($0,1,1), substr($0,5,4), substr($0,10,8), substr($0,19)}' OFS=, test_fixed_len.txt

Use sed:
sed -e 's/|[^|]*|/|/'

---------- Post updated at 02:12 PM ---------- Previous update was at 01:58 PM ----------

Or cut:
cut -d\| -f1,3-

OK, make it ls *.txt.* | awk ...

&& is Not an AND operator... Its meaning is: if TRUE( the previous test...) execute what follows, and so it make that line a true one liner. ( the contrary would be || )

Referring to the bash manpage, && is a "control operator":
AND and OR lists are sequences of one of more pipelines separated by
the && and || control operators, respectively. ...

Apologise that percent sign has special meaning in the crontab file (It's use to insert a newline) and will need to be escaped your entry should look like this:

0 9 22-31 8 * [ $(date +'\%w') -eq...

Run it on tuesdays and test if the date is 15-21...

You could also run it each month on 15th to 21st and check if it's a Tuesday.

Here I've done the check in the crontab entry, which is nice if you would like to run the script manually and the day...

Standard POSIX parameter expansions do everything you seem to want here:
#!/bin/ksh
while read base e1 e2
do touch "${base%.*}${e1:+.$e1}${e2:+.$e2}.finished"
done < ListFile.txt
${base%.*} will...

Using awk

[akshay@nio tmp]$ cat file
test1.sh
test2.sh PC1
test3.sh PC2 PC21
test4.sh
test5.sh PC3
test6.sh PC4 PC41

[akshay@nio tmp]$ awk '{sub(/\..*/,x,$1); $1=$1; $NF=$NF".finished";...

These are much easier to do with variable substitution. It sounds hard to get started, but it's easier when you get the hang of it.

Is SCRIPT_NAME a value you will read as input or do you want it...

Windows expects lines to end with \r\n. Since the logfile is encoded, the mere act of emailing it doesn't fix this. You can add carriage returns to a file with sed 's/$/\r/' < inputfile > outputfile

If you have egrep supporting the -o option the following snippet might do it:

egrep -o '\w*.lst' List1 | xargs cat >> big.list

I don't understand why any grep is needed here???

I also don't understand why you don't want:
test2.ksh
test3.ksh
in your output file in addition to what you have said you want?

But, to get...

Test it

awk -v fc=$feed_cnt 'NR==FNR { f[$0]++; next } $0 in f { total += f[$0] }; END { if (total > (0.02 * fc)) print "Errors exceed the tolerance level" }' $err_log $err_list

There are several issues here.

What operating system are you using?
What shell are you using?
What errors are you getting from your script?
Is err_list the name of a file, or is it the name...