cut

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cut prints selected parts of every line. With -d you give the separator (one character) and with -f the field numbers. With -c you select characters by position.

It is ideal for files with a fixed separator like /etc/passwd (:) or CSV (,). For columns separated by a varying number of spaces, awk is better.

طريقة الكتابة

cut OPTION... [FILE]...

الخيارات 15

الأكثر استخدامًا

-f, --fields=list: Select these fields, like 1,3 or 2-4 or 3-.
-d, --delimiter=char: The field separator (default: TAB).
-c, --characters=list: Select these character positions.
-b, --bytes=list: Select these byte positions.
-s, --only-delimited: Do not print lines that have no separator.
--complement: Print everything except the selected parts.
--output-delimiter=string: Use this separator in the output.
-z, --zero-terminated: Lines end with NUL.
-n: Ignored.
--help: Show help.
--version: Show the version.

LIST forms

N: Only field (or character) N.
N-M: From N to M.
N-: From N to the end of the line.
-M: From the first to M.

أمثلة 11

$ مستخدم عادي# بصلاحية root (أو مع sudo)

1All user names
```
$cut -d: -f1 /etc/passwd
```
Field 1 of /etc/passwd is the user name.
2User name and shell
```
$cut -d: -f1,7 /etc/passwd
root:/bin/bash
```
Fields 1 and 7, still joined by :.
3The first 8 characters of each line
```
$cut -c1-8 /etc/passwd
```
Character positions, not fields.
4Columns of a CSV file
```
$cut -d, -f2,4 users.csv
```
Fields 2 and 4 (note: quoted commas inside fields break this; use a CSV tool then).
5Everything except field 2
```
$cut -d: -f2 --complement /etc/passwd
```
Removes the password placeholder column.

6Change the output separator

$cut -d: -f1,6 --output-delimiter=' -> ' /etc/passwd
root -> /root

Readable output for a report.

7Only the group names
```
$cut -d: -f1 /etc/group | sort
```
All local groups, sorted.

8Get the IP address part of an address/prefix

$ip -4 -o addr show dev enp1s0 | awk '{print $4}' | cut -d/ -f1
192.168.122.10

cut -d/ -f1 removes the /24.

9Field 3 to the end
```
$cut -d' ' -f3- server.log
```
Drops the date and time columns of a log line.
10Skip lines without the separator
```
$cut -d= -f2 -s app.conf
```
Comment lines without = are not printed.
11The size column of a TAB separated report
```
$cut -f2 report.tsv | sort -n | tail -1
```
TAB is the default separator.

انتبه

cut uses exactly one separator character. Many spaces in a row make empty fields; use awk or tr -s ' ' first.
Field numbers start at 1.

نصائح للحفظ

cut -d: -f1 = first column of passwd-style files.

`cut`

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طريقة الكتابة

الخيارات 15

LIST forms

أمثلة 11

1All user names

2User name and shell

3The first 8 characters of each line

4Columns of a CSV file

5Everything except field 2

6Change the output separator

7Only the group names

8Get the IP address part of an address/prefix

9Field 3 to the end

10Skip lines without the separator

11The size column of a TAB separated report

انتبه

نصائح للحفظ

الدليل الكامل

ماذا يفعل

طريقة الكتابة

الخيارات 15

LIST forms

أمثلة 11

1All user names

2User name and shell

3The first 8 characters of each line

4Columns of a CSV file

5Everything except field 2

6Change the output separator

7Only the group names

8Get the IP address part of an address/prefix

9Field 3 to the end

10Skip lines without the separator

11The size column of a TAB separated report

انتبه

نصائح للحفظ

أوامر مرتبطة

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الدليل الكامل

`cut`