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sailu_mvn 07-28-2006 01:40 AM
join files using shell script
 
I have 3 files that are to be joined. Can anybody tell me how to stat writing a shell script?

And one more thing. In a file if at some point if i need to insert some text, how to do it.

For eg, a file called a.txt has at somepoint "NOTHING CAN HAPPEN" line. After that if i want to insert a paragraph, can i do that?

crazyjimbo 07-28-2006 01:43 AM
To join files, use:

Code:
cat inputfile1 inputfile2 inputfile3 > outputfile

sailu_mvn 07-28-2006 01:51 AM
yeah i know it
if i have a file and i have to insert a paragraph at some articular localtion say line number 45
How to do it

spirit receiver 07-28-2006 02:02 AM
This will make a backup of the original file:
Code:
sed -i.bak -e'45,s/^/your new text here\n/' your_filename

raskin 07-28-2006 02:05 AM
line_number=$(cat f1 |wc -l);
head -45 f1; cat f2; tail -$((line_number-45)) f1;

konsolebox 07-28-2006 02:13 AM
well we meet again raskin.

to sailu_mvn you can try my script

Code:
#!/bin/bash

FILE=
INJECT=
LINENO=

{
        cat "$FILE" | sed -n 1,$((LINENO - 1))p
        cat "$INJECT"
        cat "$FILE" | sed -n ${LINENO},\$p
} > .tmp

cat .tmp > "$FILE"
rm .tmp
if something's wrong just try to fix it. it's easy to get its idea.

regards :)


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