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Shell Programming and Scripting

concat fields

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# 1  
Old 10-22-2006
concat fields
hi

I have a file, I need to concatenate depening on the no of columns i need to concatenate.
for example i need to concatenate field1,filed34,field2( no of columns is not always 3, it can be any number of fields)
concat.ksh field1 field34 field2

how to achieve this, is there any argv ,argc equivalent in ksh.

Hope i am clear

Mark.
# 2  
Old 10-22-2006
You shoud look at the $# and $1, $2,... constructs for ksh. In short $# gives you the number of command line parameters, and $1, $2 gives the parameter1, parameter2. Read man ksh for more details.
# 3  
Old 10-23-2006
just remove the spaces in each line using sed

cat file|while read line
do
sed 's/ //'
done>output_file
# 4  
Old 10-23-2006
sorry , i didn't phrase the question correctly.
actually i have those particular fields that needs to be concatenated in a variable.

like this
var1 = 1 24 3

so i need to concatenate these fields, please let me know.

Thanks
Mark.
# 5  
Old 10-23-2006
start with awk
Code:
#!/bin/ksh
# $1 $2 $3 equal a field number  eg, 1 7 32
echo "$myvariable" | awk -v one=$1 -v two=$2 -v three=$3 '{ print $one $two $three  }' | read new_variable
# new_variable has the three fields concatenated

# 6  
Old 10-23-2006
Jim, this works if we know how many fields we are concatenating.,

in my case, i have n number of fields in the variable that needs to be concatenated.

How can i achieve this. Thanks all for your help.
Last edited by markjason; 10-23-2006 at 12:44 PM..
# 7  
Old 10-23-2006
Another way (assume single space as field separator)
Code:
var='1 24 3'
cut -d' ' -f$(echo $var|sed 's/ /,/g')


Jean-Pierre.
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