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purpose:
display certain line or lines from a text file, such as :
display the 1000th line from file message.log
or
display the lines between 1000 and 1020 from file message.log
solution:
using sed:
sed -n '1000,1020p' message.log
sed -n '1000,1020p; 1021q' message.log #break after read out 1020th line.
using awk:
awk '{if ((nr >= 1000) && (nr <= 1020)) print $0}' message.log
using cat && grep:
cat -n message.log | grep -a 20 '^ *1000'
using nl && grep:
nl message.log | grep -a 20 '^ *1000'
using tail && head:
tail -n 1000 message.log | head 20
head -n 1000 message.log | tail 20
ref:
- http://serverfault/questions/133692/how-to-display-certain-lines-from-a-text-file-in-linux
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