Show certain lines by line number: Difference between revisions
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(Created page with "Show certain lines by line number of string file == Testing text file == <pre> echo "line 1" > test.txt echo "line 2" >> test.txt echo "line 3" >> test.txt echo "line 4" >> t...") |
Tags: Mobile edit Mobile web edit |
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Line 1: | Line 1: | ||
Show certain lines by line number of string file | Show certain lines by line number of string file | ||
== | == Prepare the testing text file == | ||
<pre> | <pre> | ||
echo "line 1" > test.txt | echo "line 1" > test.txt |
Revision as of 11:51, 1 December 2019
Show certain lines by line number of string file
Prepare the testing text file
echo "line 1" > test.txt echo "line 2" >> test.txt echo "line 3" >> test.txt echo "line 4" >> test.txt echo "line 5" >> test.txt echo "line 6" >> test.txt
Approaches
Using cat, head & tail commands
1. key-in the command[1]
# X: start line number # Y: end line number X=2 Y=4 Z=$(($Y-$X+1)) cat test.txt | head -n $Y | tail -n $Z
result
line 2 line 3 line 4
2. key-in the command if you want to show the line number of each line
# X: start line number # Y: end line number X=2 Y=4 Z=$(($Y-$X+1)) cat -n test.txt | head -n $Y | tail -n $Z
result
2 line 2 3 line 3 4 line 4
Using sed command
key-in the command[2]
# X: start line number # Y: end line number X=2 Y=4 Z=$(($Y-$X+1)) sed -n -e "$X,$Y p" -e "$Y q" test.txt
result
line 2 line 3 line 4