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Reading data from file and assigning to variable

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# 1  
Old 12-14-2009
Reading data from file and assigning to variable
I was trying to store the number of lines in a file and store it in a file.after that i want to store the information in a file to a variable which is further used in the if loop to check certain condition.

Code:
#!/bin/bash
cat <file> | wc -l > count.txt
x="$count.txt";
i=10;
if [ "$x" -lt "$i" ]; then
cat file1 > test.txt
else
cat file2 > test.txt
fi

but above script is not working for both conditions.

Please help me
Last edited by pludi; 12-14-2009 at 02:31 PM.. Reason: code tags, please...
# 2  
Old 12-14-2009
I don't really understand what you want to do but there are already some mistakes in your script
Code:
#!/bin/bash
cat <file> | wc -l > count.txt # the '<' and '>' characters are reserved for redirecting output
# syntax should be
wc -l file > count.txt
x="$count.txt"; # Is there a variable named count.txt ? (not valid name for a variable). Should be:
x=$(cat count.txt)
 i=10;if [ "$x" -lt "$i" ]; then
cat file1 > test.txt # is file1 a file? if so, yous should just copy like:
cp file1 test.txt
else
cat file2 > test.txt
fi

But i really don't understand why you want to store the count in a file (except if you want to re-use it in the same or another script). Tell us what you need finally.
The whole thing shorter :
Code:
#!/bin/bash
x=$(wc -l < file)
i=10
if [ "$x" -lt "$i" ]
then cp file1 test.txt
else cp file2 test.txt
fi

Last edited by frans; 12-14-2009 at 06:08 PM.. Reason: Correction, thanks to Scrutinizer
# 3  
Old 12-14-2009
Code:
x=$(wc -l < file)

# 4  
Old 12-15-2009
i was tried to use the command
x=$(wc -l < file)
in the script but when iam excuting getting error as
syntax error at line 2: `(' unexpected

Code :
#!/bin/bash
x=$(wc -l < file)
i=10
if [ "$x" -lt "$i" ]
then cp file1 test.txt
else cp file2 test.txt
fi
# 5  
Old 12-15-2009
Cab you test the script with -x option :
Code:
bash -x path_to_script

# 6  
Old 12-15-2009
original script :
#!/bin/bash
x= $( wc -l < ATPBSC2log.txt-APT )
i=10;
if [ "$x" -lt "$i" ];
then cp /tmp/ATPBSC2log.txt-APT test.txt
else cp /tmp/ATPBSC2log.txt-APT test1.txt
fi

after excuting "bash -x script" output is :
++ wc -l
+ x=
+ 0
s.sh: line 2: 0: command not found
+ i=10
+ '[' '' -lt 10 ']'
s.sh: line 4: [: : integer expression expected
+ cp /tmp/ATPBSC2log.txt-APT test1.txt
# 7  
Old 12-15-2009
There shouldn't be any space around the assignement '=' in line 2. Write
Code:
x=$( wc -l < ATPBSC2log.txt-APT )
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