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counting the number of lines - again

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# 1  
Old 12-17-2008
counting the number of lines - again
Hi all,
I use bash shell and I have a problem with wc.
I would like to determine the number of lines in a file so I do
wc -l filename
but I don't want to get the filename again
I just would like to have the number of lines and use it in a variable.
Can anybody help?
Thank you,
# 2  
Old 12-17-2008
Code:
#!/bin/bash

lines=$(wc -l < myFile)

echo "lines->[${lines}]"

# 3  
Old 12-17-2008
It works, thank you.
I have another problem.

LINES=$(wc -l < filename)
echo $LINES
LINES=`expr ${LINES} - 1`
echo $LINES
but I cannot decrement by 1.

I get the following

12484
expr: non-numeric argument
# 4  
Old 12-17-2008
Code:
#!/bin/bash

typeset -i lines

lines=$(( $(wc -l < /tmp/a.txt) - 1 ))

echo "lines-1 = [${lines}]"

# 5  
Old 12-17-2008
Quote:
Originally Posted by vgersh99
Code:
#!/bin/bash

typeset -i lines

lines=$(( $(wc -l < /tmp/a.txt) - 1 ))

echo "lines-1 = [${lines}]"

sorry but I get

lines-1 = [12482]
': not a valid identifiers
# 6  
Old 12-17-2008
works for me - don't see any ':' in the code.
make sure your code is not 'polluted'....
# 7  
Old 12-17-2008
Tools A couple of different approaches
By using a tail command, you can skip to the 2nd line of a file
Code:
> wc -l <file110
21
> tail +2 file110 | wc -l
20
> lines=$(wc -l <file110)
> echo $lines
21
> lines=$(tail +2 file110 | wc -l)
> echo $lines
20

Or, you can use bc as a calculator
Code:
> lines=$(wc -l <file110)
> echo $lines -1 | bc
20
> newlines=$(echo $lines -1 | bc)
> echo $newlines
20
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