[SOLVED] add text at the beginning and at the end of lines in a file

smithy2010 · 07-19-2012, 04:42 PM

Hello all,

I have one text file with about 15 lines of data. I am trying to write a script that would add this <p> at the beginning and at the end of a line, from line 5 to line 15, but ignore first 5 lines of text.

I had a go with the sed command but I just don’t know how to do it, can anyone advice of ways to achieve this please?

Thank you in advance

D.

whizje · 07-19-2012, 04:57 PM

Code:

ash-4.2$ sed '5,15 s/.*/<p>&<p>/' test
      361459	447394	  CHL1
      290282	290282	  CHL1
      361459	447394	  CHL1
      361459	447394	  CHL1
<p>      178352861	178363529 AGA<p>
<p>      178352861	178363529 AGA<p>
<p>      178363657	178363657 AGA<p>
<p>361459	447394	  CHL1<p>
<p>      290282	290282	  CHL1<p>
<p>      361459	447394	  CHL1<p>
<p>      361459	447394	  CHL1<p>
<p>      178352861	178363529 AGA<p>
<p>      178352861	178363529 AGA<p>
<p>      178363657	178363657 AGA<p>
<p> 178363657	178363657 AGA<p>

PTrenholme · 07-19-2012, 06:25 PM

For that sot of thing, bash should suffice.

Code:

#!/bin/bash
count=0
while read -r line
do
  if [ ${count} -lt 5 ]
  then
    echo ${line}
  else
    echo "<p>${line}</p>"
  fi
  count=$((++count))
done < ${1:-/dev/stdin}

Example:

Code:

$ ls -l | bash smithy2010
total 92
-rw-rw-r-- 1 Peter Peter 28500 Feb 27 14:26 Brews ohare.txt
-rwxrwxr-x 1 Peter Peter 6551 Feb 27 14:26 enum
-rw-rw-r-- 1 Peter Peter 222 Feb 27 14:26 enum.c
-rw-rw-r-- 1 Peter Peter 23947 Feb 27 14:26 output
<p>-rwxrwxr-x 1 Peter Peter   220 Feb 27 14:26 rock1961.gawk</p>
<p>-rw-rw-r-- 1 Peter Peter    57 Feb 27 14:26 rock1961.txt</p>
<p>-rwxr-xr-x 1 Peter Peter   673 Feb 27 14:26 scramble</p>
<p>-rw-rw-r-- 1 Peter Peter   173 Jul 19 16:19 smithy2010</p>
<p>-rwxrwxr-x 1 Peter Peter  1255 Feb 27 14:26 squash</p>
<p>-rw-rw-r-- 1 Peter Peter  1873 Feb 27 14:26 swap</p>
<p>-rw-rw-r-- 1 Peter Peter  1669 Feb 27 14:26 tuxlux.awk</p>

rosehosting.com · 07-19-2012, 08:00 PM

Using awk

Code:

$ awk '{ if (NR>=5 && NR<=15) print "<p>"$0"</p>"; else print $0}' test
1
2
3
4
<p>5</p>
<p>6</p>
<p>7</p>
<p>8</p>
<p>9</p>
<p>10</p>
<p>11</p>
<p>12</p>
<p>13</p>
<p>14</p>
<p>15</p>

grail · 07-19-2012, 09:16 PM

Alternative sed (although I think the tag at the end needs the slash):

Code:

sed -r 's/^|$/<p>/g' file

Awk can also be shortened:

Code:

awk 'NR>=5 && NR<=15{$0="<p>"$0"</p>"}1' file

David the H. · 07-20-2012, 12:06 PM

Similarly, using ed:

Code:

printf '%s\n' '5,15 s/.*/<p>&<p>/' ',p' | ed -s infile

',p' prints the altered file to stdout. Change to 'w' to write it back to the original file.

And as grail mentioned, if the end tag is actually "</p>" then you'll have to backslash escape the forward slash.

How to use ed:
http://wiki.bash-hackers.org/howto/edit-ed
http://snap.nlc.dcccd.edu/learn/nlc/ed.html
(also read the info page)

smithy2010 · 07-22-2012, 04:07 AM

Hello all,

Thank you very much for your reply, I found this command to be the most suitable sed -i '5,15 s/.*/<p>&<p>/' file name.

Best wishes

D.