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Script to check the files existence inside a directory.


 
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# 1  
Script to check the files existence inside a directory.

Hello Folks,

On Below Script, I want to apply condition.
Condition that it check the directory for files if not found keep checking.
Once directory have files and founded do the calculation and finish the code.

Script to check the files existence inside a directory, If not then keep checking in loop unless it found and apply the rest of the logic and exit.

How can i achieve that?

Kindly guide.





Code:
#!/bin/bash
DATE=`date +"%d-%m-%Y-%H:%M"`
FLAG=FIRST
stream=IUCS
path="/bigpfstest/DPI_INVESTIG/IUCS"
for  files in `printf "%s\n" $path/* | tail -5`
        do
	TTHEX=`awk -F ',' 'END{print $4}' $files`
        TIMESTAMP=$( date +'%H:%M:%S' -r $files)
        TRANS_TIME=$(date -d @$(expr `printf "%d" 0x$TTHEX` / 1000) | awk '{print $4}')
        TIME_LAG=$(date +%H:%M:%S -ud @$((`expr $(date -u -d "$TIMESTAMP" +"%s") - $(date -u -d "$TRANS_TIME" +"%s")`)))
        echo "${DATE} ${stream} ${FLAG} $(ls -l $files | awk '{print $9}'| cut -d '/' -f5) ${TIMESTAMP} ${TRANS_TIME} ${TIME_LAG}"  >>IUCS_TEST.csv
        done

# 2  
You can wrap your for-loop by an infinite loop, end exit the script once you did your calculation:

Code:
while true
do
    for ...
    do
       ...
       exit 0
    done
    sleep 123
done

This User Gave Thanks to rovf For This Post:
# 3  
This might be neater as a while or until loop:-
Code:
while [ ! -f $path/* ]
do
    sleep 5              # 5 second pause, or whatever else you want to do
done

# Rest of script here

... or ...
Code:
until [ -f $path/* ]
do
    sleep 5              # 5 second pause, or whatever else you want to do
done

# Rest of script here

It depends how best suits the flow of reading your logic.


Does that help?


Robin
This User Gave Thanks to rbatte1 For This Post:
# 4  
It is of course a matter of taste. I personally don't like your solution so much, because it globs for the files twice (in the while- and in the for-loop), which makes maintenance more difficult (think about the case, when the requirement changes and you have to look for files matching, say, *.log, instead of * ... you have to remember to make the change in two places).

Of course if we start thinking in this way, there is much more which could be improved in this script .....
These 2 Users Gave Thanks to rovf For This Post:
# 5  
^^^ he didn't take my suggestions either in the other thread he started.
This User Gave Thanks to jgt For This Post:
# 6  
Quote:
Originally Posted by jgt
^^^ he didn't take my suggestions either in the other thread he started.
Some people are more choosy than others! Smilie
This User Gave Thanks to rovf For This Post:
# 7  
@rbatte1: while your proposal will work fine in an empty directory, if you're expecting one single matching file, it will fail should there be more than one. Which is not too far fetched according to what the requestor posted in post#1. So additional measures should be taken to avoid the error condition.
These 3 Users Gave Thanks to RudiC For This Post:

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