i=0
while read WORT
do
echo $WORT|grep a>/dev/null || echo$WORT|grep B>dev/null || let i=$i+1
done
echo $i
The first lane initializie the variable i with the value of 0.
The loop line has 3 different options because of ||. The only option I understand
is that i gets +1 everytime if the other two options dont apply.
Last line just gives out the value i after the while loop is done.
I dont understand this line "echo $WORT|grep a>/dev/null || echo$WORT|grep B>dev/null "
Last edited by Don Cragun; 02-01-2018 at 06:37 PM..
Reason: Add ICODE tags.
The script tries to count how many times the input does not contain the letter a then does not contain the letter B. The while loop does not stop though. The second grep should direct to /dev/null (the slash is missing). There should also be a space after echo. A slight change could be:
Code:
i=0
WORT=0
while read WORT && [ -n "$WORT" ]
do
echo $WORT|grep a>/dev/null || echo $WORT|grep B>/dev/null || let i=$i+1
done
echo $i
I still dont actually understand it. In my solution I have like 15 files
Abbe, Ananas, Apfel, Apfelsine, Asterix, Backen, Berg, Burg, Hacken, Halle,
Huepfen, Obelix, Schuber, Werbung, Barbier
to use this script it would be ls | /home/notroot/scripts/myscript.sh
Code:
16 times "read Wort"
15 times "echo $WORT|grep a>/dev/null
10 times echo $WORT|grep B>/dev/null
8 Timeslet i=$i+1
1 time echo$i
Can you tell me why would it count like 15 times for a or 10 tims for B?
Moderator's Comments:
Please use CODE tags (not ICODE tags) when displaying full-line and multi-line code segments, sample input, and sample output. Use ICODE tags when displaying partial-line code segments, sample input, and sample output.
Last edited by Don Cragun; 02-01-2018 at 06:46 PM..
Reason: Change ICODE tags to CODE tags; add ICODE tags.
With the explanation from earlier I get that grep a>/dev/null does count if the file contains the letter a right?
Is the reason for 15 times because its the first instruction if yes then I guess I understand this part. But what is with B?
Hi
My friend wrote this particular script and won't tell me what it does, and when I run it I don't understand it.
What does the entire script do with specifics please.
Thanks
Bob
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02-01-2018
