Remove numbers after colon

Question

I have a file as fololows:

1:01
4:04
7:07
5:05
3:03

The general pattern is <a number>:0<the same number before colon>. I would like to remove the colon and everything after the colon. This would produce.

What would be an easy way to acheive this in bash or python.

`awk -F: '{ print $1 }'` – Andreas Louv Dec 07 '16 at 07:43 — Andreas Louv, Dec 07 '16 at 07:43

score 3 · Answer 1 · edited Dec 07 '16 at 08:59

3

Pythonic way:

Take the input as a list of strings, say

>>>input = ['1:01', '4:04', '7:07', '5:05', '3:03']

Make a list with the desired output using split and a list comprehension

>>>output = [i.split(':')[0] for i in input]

Now you have the required output :

>>>output
['1', '4', '7', '5', '3']

edited Dec 07 '16 at 08:59

Laurens Koppenol

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answered Dec 07 '16 at 07:49

ABcDexter

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Pythonic would be `output = [x.split(':')[0] for x in input]` – Laurens Koppenol Dec 07 '16 at 07:59
Yes, that's better. – ABcDexter Dec 07 '16 at 08:23

score 2 · Accepted Answer · answered Dec 07 '16 at 07:44

2

Umm, if it's exactly like your example-

awk -F: '{print $1}' file

The -F flag sets the delimiter to be the:. The print $1 asks for the stuff before the colon, which is what you want.

answered Dec 07 '16 at 07:44

Chem-man17

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for editing it inplace will `gawk -i inplace -F: '{print $1}' file` work out? Or is there a better way to edit inplace using awk? – Stormvirux Dec 07 '16 at 07:48
Yes. Otherwise you could even do- `awk -F: '{print $1}' file > temp ; mv temp file` – Chem-man17 Dec 07 '16 at 07:49

score 2 · Answer 3 · answered Dec 07 '16 at 07:49

2

Using cut:

cut -d':' -f1 file

answered Dec 07 '16 at 07:49

oliv

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Again! same idea, same time :D – hek2mgl Dec 07 '16 at 07:50

score 2 · Answer 4 · answered Dec 07 '16 at 07:49

2

That's a job for the cut command:

cut -d: -f1 input.file

answered Dec 07 '16 at 07:49

hek2mgl

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score 1 · Answer 5 · answered Dec 07 '16 at 07:45

1

Python:

text= '1:01'
sep = ':'
rest = text.split(sep, 1)[0]

Out: 

1

answered Dec 07 '16 at 07:45

SerialDev

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Remove numbers after colon

5 Answers5

Pythonic way: