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B
cat, an acronym for concatenate, lists a file to stdout. When combined with redirection (> or >>), it is commonly used to concatenate files. # Uses of 'cat'cat filename # Lists the file.cat file.1 file.2 file.3 > file.123 # Combines three files into one.
So it is normal, that cat expects a filename!
So it is normal, that cat expects a filename!
W
yea, I just used it in the wrong place 
It work now (It took my teacher the same number of tries that I had already attempted to find the error though..)
I wonder how many ways it can be solved....
(I used cat, not sure how to make it work the other way, but now I at least have something that can be handed in)
It work now
(It took my teacher the same number of tries that I had already attempted to find the error though..)I wonder how many ways it can be solved....
(I used cat, not sure how to make it work the other way, but now I at least have something that can be handed in)
W
1 #!/bin/bash
2 #
3 # Per Ulrik Arntsen
4 # Høgskolen i Nesna
5 # Liste_demo
6 # v.2.0
7
8 teller=0
9
10
11 while read navn
12
13 do
14 teller=$((teller + 1))
15 echo $navn
16
17 done < navn-1.txt
18
19 echo " "
20 echo "Det var $teller navn tilsammen"
21 echo " "
============INPUT:
Bjørn Bjørnsen, Mosjøen, Informasjonsvitenskap
Bjørn Pedersen, Mo i Rana, Informatikk
Øyvind Østensen, Mo i Rana, Informatikk
Anders Bjærtnes, Mosjøen, Informatikk
Anne Båtvik, Mo i Rana, Informasjonsvitenskap
Ågot Ærtnes, Sandnessjøen, Informasjonsvitenskap
Per-Arne Pedersen, Mørkved, Læreutdanningen
Anders Østensen, Mosjøen, Informatikk
*It loops over the names and counts them
2 #
3 # Per Ulrik Arntsen
4 # Høgskolen i Nesna
5 # Liste_demo
6 # v.2.0
7
8 teller=0
9
10
11 while read navn
12
13 do
14 teller=$((teller + 1))
15 echo $navn
16
17 done < navn-1.txt
18
19 echo " "
20 echo "Det var $teller navn tilsammen"
21 echo " "
============INPUT:
Bjørn Bjørnsen, Mosjøen, Informasjonsvitenskap
Bjørn Pedersen, Mo i Rana, Informatikk
Øyvind Østensen, Mo i Rana, Informatikk
Anders Bjærtnes, Mosjøen, Informatikk
Anne Båtvik, Mo i Rana, Informasjonsvitenskap
Ågot Ærtnes, Sandnessjøen, Informasjonsvitenskap
Per-Arne Pedersen, Mørkved, Læreutdanningen
Anders Østensen, Mosjøen, Informatikk
*It loops over the names and counts them
B
< FILENAME
# Accept input from a file.
Soooo that seems to mean that:
while read X
...
done < file
automaticly means that the while conditions lasts for each X (word) in the file. While needs a condition that continues or ends at a certain point, and for "read X", it needs a source to "read" something. So while it has something to read, it continues the loop, untill it hasn't got anything left to read (the last word of the file has been read).
# Accept input from a file.
Soooo that seems to mean that:
while read X
...
done < file
automaticly means that the while conditions lasts for each X (word) in the file. While needs a condition that continues or ends at a certain point, and for "read X", it needs a source to "read" something. So while it has something to read, it continues the loop, untill it hasn't got anything left to read (the last word of the file has been read).
W
yes, I understand all of that, what I don't understand is that the intro to bash says it interprets one and one line
so i don't get how it can know, when the loop starts, that the file used at done is the one it should loop through, as I would then assume it did not yet know about it... but maybe that all changes when it is saved as a sh file or something
so i don't get how it can know, when the loop starts, that the file used at done is the one it should loop through, as I would then assume it did not yet know about it... but maybe that all changes when it is saved as a sh file or something
B
Don't take the too literally. What they mean is that it isn't object oriënted. Sometimes it has to look to another line when interpreting.
See this as one line: While [condition] [code that has to be done if true] done [options]
The [code that has to be done] can exist in severl lines
The [options] (like <filename) belong to the while line, so that makes sense
See this as one line: While [condition] [code that has to be done if true] done [options]
The [code that has to be done] can exist in severl lines
The [options] (like <filename) belong to the while line, so that makes sense
