Linux Tips and Tricks

Linux Tips and Tricks

Print Line Numbers and File contents

September10

Create a file called printNum.txt

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$ echo "A
> B
> C
> D
> E
> F" > printNum.txt

Display the file using the cat command

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$ cat printNum.txt 
A
B
C
D
E
F

Put numbers in all the lines using cat command

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$ cat -n printNum.txt 
     1	A
     2	B
     3	C
     4	D
     5	E
     6	F

Put number in all the lines using awk command

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$ awk '{print NR,$0}' printNum.txt 
1 A
2 B
3 C
4 D
5 E
6 F

Using Perl

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$ perl -lane 'print "$. $_" ;' printNum.txt
1 A
2 B
3 C
4 D
5 E
6 F

Using grep command

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$ cat my_test
NUM_SCENARIOS=100
REP_NUM_SCENARIOS=10
 
$ grep -n . my_test
1:NUM_SCENARIOS=100
2:REP_NUM_SCENARIOS=10
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