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Same principal approach as bakunin's, but mayhap a bit less resource consuming (no cat nor echo (i.e. opening time stamp file twice), just file system (meta data) operation, running date just once),...

This is an example of what is called "inter-process communication" because one process (the program to be started) needs some information of another process (the last instance of the program and when...

The problem is that you use -a outside the brackets. The -a and -o operators belong to the test/[ ] command and can't be used outside. Then on the right side you use the || inside the brackets but...

Hi, in bash, try:
if [[ $run == 1 && ( -f /tmp/start.Lck || -f /tmp/stop.Lck ) ]]

There should be no space between the double brackets.

/is running/ doesn't match is Running.

Maybe I'm being thick, but what is the ls -lrt | for? I don't see it having any purpose the way it is coded. You need to quote $z when you use it to preserve the whitespace too.

If you want to...

I agree with MadeInGermany with one caveat: You are being precise with the number of characters in the date segments of the filename, and then blowing it with the spaces. Your pattern would match...

The pipe feeding the loop does nothing useful because the filenames are picked by matching the pattern you give after in with the content of your current directory.
Arguments for commands and...

And if the filenames always contain an 8 digit date followed by an underscore and a 4 digit time (YYYYMMDD_hhmm) and the desire is to sort on the date and time, you could try:
ls | sed...

Try something like:
ls | sed 's/.*\([0-9]\{8\}\)/\1 &/' | sort -k1,1n | cut -c10-

This assumes that 8 digits always constitute a date..


--
If the date is always followed by an underscore...

Multiple file testing like rbatte1 tried to tell, if you need only know if some while include something.

found=0
for f in A*.rej
do
[ ! -s "$f" ] && continue
found=1
break
done
[...

This will work :-

found=0
if [ -s A123.rej ]
then
found=1
fi

if [ -s A345.rej ]
then
found=1
fi

if [ $found = 0 ]
then
echo "No Data"
else
echo "Data found"
fi

You could also try the following:-[ $(wc -l A*.rej | tail -1) = "0 total" ] && echo "No data" || echo "Data"...... or for each individual file:-for file in A*.rej
do
[ -s "$file" ] && state="no...

That specification still is not that easy to understand. "No Data" seems not to be equivalent to "empty file", so the -s primary in the conditional expression can't be used. Aside: -s requires one...

If you invoke your script with two parameters where the 1st parameter is the field separator and the 2nd parameter is the expected number of fields, just using:
awk -F "$1" -v cnt="$2" 'NF!=cnt...

Try
awk -F'|' '
NR == 1 {n = split (FLDS, ARRX, ",")
}

{IX = ""
for (i=1; i<=n; i++) IX = IX FS $ARRX[i]
}

!x[IX] {x[IX] = $0
L[IX] = 1
...

Hello grinkrf,

Could you please try following too once and let me know if this helps you.
You could dynamically put as per file like whichever field you want to check.

awk -F"," 'function...

A semi-colon is missing:

$ sed '/^.AR/{s/AR/yyy/; s/.$//;}' f01

I created a file with your posted data. Two things to note here:
(1) I replaced all spaces by "*" so they are easily visible.
(2) The length of each line is 24. It wasn't so in your post, but I...

This replaces position 2-3 with yyy, shifting the remainder by +1
sed 's/\(.\{1\}\)../\1yyy/'