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05-09-2008
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How to insert text in the middle of a file
Hey guys, how do we take a line of text as an argument from a user and then insert it in the middle of a file irrespective of the number of lines in the file. I am trying to do this without SED or AWK. Inserting it in the beginning and at the end is easy, but i am trying to accomplish inserting text in the middle?
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05-09-2008
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One way - file has 10 lines
Code:
head -10 file > newfile echo "line of text ">> newfile tail -10 file >> newfile
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05-09-2008
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How to insert text in the middle of a file w/o SED or AWK!!
tht dint wrk as i am trying to do this using a script..im pasting the script
#!bin/bash echo "Enter a line of text"; read text; echo "Enter the file path to append to"; read path; nfline=$(wc -l $path); middle=$($nfline/2); head -$middle $path > tmpfile; $text >> tmpfile; tail -$middle $path >> tmpfile; mv tmpfile $path; more $path; Last edited by kartikkumar84@g; 05-09-2008 at 06:06 PM.
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05-09-2008
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wc -l filename
does not work because it returns the file name as well, so it cant be used in an expression.
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05-10-2008
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Quote:
Code:
cnt=`wc -l < filename`
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05-10-2008
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yup thank u!
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05-10-2008
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Here is another way of doing it using ed(1)
Code:
#!/bin/ksh93
TMP=file.$$
read TEXT?"Enter a line of text: "
read path?"Enter the file path to append to: "
MIDDLE=$(( $(/bin/wc -l < $path)/2 ))
# build editing command file
cat <<EOT >$TMP
${MIDDLE}
a
${TEXT}
.
w
q
EOT
cat $TMP
# go do the work
/bin/ed -s $path < $TMP
rm $TMP
cat $path
exit 0
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