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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (How to Delete Lines from a File Using the sed Command)
+[#]: via: (https://www.2daygeek.com/linux-remove-delete-lines-in-file-sed-command/)
+[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
+
+How to Delete Lines from a File Using the sed Command
+======
+
+Sed command stands for Stream Editor, is used to perform basic text transformations in Linux.
+
+sed is one of the important command, which plays major role for file manipulation. It can be used to delete or remove specific lines which matches a given pattern.
+
+Also, it’s used to remove a particular line in a file.
+
+It’s capable to delete expressions as well from a file, which can be identified by a specifying delimiter (such as a comma, tab, or space).
+
+There are fifteen examples are listed in this article, which helps you to become a master in sed command.
+
+If you understand and remember all these commands that can be useful in many ways. Also, it saves lot of time when you have some requirements to perform sed command.
+
+**`Note:`**` ` Since it’s demonstration purpose so, i use sed command without `-i` option which prints the contents of the file on Linux terminal by removing the lines.
+
+But, if you would like to remove the lines from the source file in real environment then use `-i` option with sed command.
+
+To test this, i have created the sed-demo.txt file and added the following contents with line number for better understanding.
+
+```
+# cat sed-demo.txt
+
+1 Linux Operating System
+2 Unix Operating System
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 1) How to Delete First Line from a File?
+
+If you would like to delete first line from a file, use the following syntax.
+
+**`N`**` ` denotes Nth line in a file and d option in sed command is used to delete a line.
+
+**Syntax:**
+
+```
+sed 'Nd' file
+```
+
+The below sed command removes the first line in sed-demo.txt file.
+
+```
+# sed '1d' sed-demo.txt
+
+2 Unix Operating System
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 2) How to Delete Last Line from a File?
+
+If you would like to delete first line from a file, use the following syntax.
+
+The **`$`**` ` denotes the last line of a file.
+
+The below sed command removes the last line in sed-demo.txt file.
+
+```
+# sed '$d' sed-demo.txt
+
+1 Linux Operating System
+2 Unix Operating System
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+```
+
+### 3) How to Delete Particular Line from a File?
+
+The below sed command removes the third line in sed-demo.txt file.
+
+```
+# sed '3d' sed-demo.txt
+
+1 Linux Operating System
+2 Unix Operating System
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 4) How to Delete Range of Lines from a File?
+
+The below sed command removes the lines ranging from 5 to 7.
+
+```
+# sed '5,7d' sed-demo.txt
+
+1 Linux Operating System
+2 Unix Operating System
+3 RHEL
+4 Red Hat
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 5) How to Delete Multiple Lines from a File?
+
+The sed command is capable to removes set of given lines.
+
+In this example, the following sed command removes 1st line, 5th line, 9th line, and last line.
+
+```
+# sed '1d;5d;9d;$d' sed-demo.txt
+
+2 Unix Operating System
+3 RHEL
+4 Red Hat
+6 Arch Linux
+7 CentOS
+8 Debian
+```
+
+### 5a) How to Delete Lines Other Than the Specified Range from a File?
+
+Use the following sed command to remove all the lines from the file only except specified range.
+
+```
+# sed '3,6!d' sed-demo.txt
+
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+```
+
+### 6) How to Delete Empty or Blank Lines from a File?
+
+The following sed command removes the empty or blank lines from sed-demo.txt file.
+
+```
+# sed '/^$/d' sed-demo.txt
+
+1 Linux Operating System
+2 Unix Operating System
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 7) How to Delete Lines That Contain a Pattern from a File?
+
+The following sed command removes the lines in sed-demo.txt file which match the **`System`**` ` pattern.
+
+```
+# sed '/System/d' sed-demo.txt
+
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 8) How to Delete Lines That Containing One of Multiple Strings from a File?
+
+The following sed command removes the lines in sed-demo.txt file which match the **`System`**` ` or **`Linux`**` ` pattern.
+
+```
+# sed '/System\|Linux/d' sed-demo.txt
+
+3 RHEL
+4 Red Hat
+5 Fedora
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 9) How to Delete Lines That Begin with Specified Character from a File?
+
+The following sed command removes all the lines that start with given character.
+
+To test this, i have created another file called sed-demo-1.txt with following contents.
+
+```
+# cat sed-demo-1.txt
+
+Linux Operating System
+Unix Operating System
+RHEL
+Red Hat
+Fedora
+debian
+ubuntu
+Arch Linux - 1
+2 - Manjaro
+3 4 5 6
+```
+
+The following sed command removes all the lines that start with character **`R`**` `.
+
+```
+# sed '/^R/d' sed-demo-1.txt
+
+Linux Operating System
+Unix Operating System
+Fedora
+debian
+ubuntu
+Arch Linux - 1
+2 - Manjaro
+3 4 5 6
+```
+
+The following sed command removes all the lines that start with character either **`R`**` ` or **`F`**` `.
+
+```
+# sed '/^[RF]/d' sed-demo-1.txt
+
+Linux Operating System
+Unix Operating System
+debian
+ubuntu
+Arch Linux - 1
+2 - Manjaro
+3 4 5 6
+```
+
+### 10) How to Delete Lines That End with Specified Character from a File?
+
+The following sed command removes all the lines that end with character **`m`**` `.
+
+```
+# sed '/m$/d' sed-demo.txt
+
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+The following sed command removes all the lines that end with character either **`x`**` ` or **`m`**` `.
+
+```
+# sed '/[xm]$/d' sed-demo.txt
+
+3 RHEL
+4 Red Hat
+5 Fedora
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 11) How to Delete All Lines That Start with Capital Letters
+
+Use the following sed command to remove all the lines that start with entirely in capital letters.
+
+```
+# sed '/^[A-Z]/d' sed-demo-1.txt
+
+debian
+ubuntu
+2 - Manjaro
+3 4 5 6
+```
+
+### 12) How to Delete a Matching Pattern Lines with Specified Range in a File?
+
+The below sed command removes the pattern **`Linux`**` ` only if it is present in the lines from 1 to 6.
+
+```
+# sed '1,6{/Linux/d;}' sed-demo.txt
+
+2 Unix Operating System
+3 RHEL
+4 Red Hat
+5 Fedora
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 13) How to Delete Pattern Matching Line and also the Next Line?
+
+Use the following sed command to delete the line which containing the pattern ‘System’ and also the next line.
+
+```
+# sed '/System/{N;d;}' sed-demo.txt
+
+3 RHEL
+4 Red Hat
+5 Fedora
+6 Arch Linux
+7 CentOS
+8 Debian
+9 Ubuntu
+10 openSUSE
+```
+
+### 14) How Delete lines that contains Digits from a File?
+
+The below sed command removes all the lines that contains digits.
+
+```
+# sed '/[0-9]/d' sed-demo-1.txt
+
+Linux Operating System
+Unix Operating System
+RHEL
+Red Hat
+Fedora
+debian
+ubuntu
+```
+
+The below sed command removes all the lines Begin with digits.
+
+```
+# sed '/^[0-9]/d' sed-demo-1.txt
+
+Linux Operating System
+Unix Operating System
+RHEL
+Red Hat
+Fedora
+debian
+ubuntu
+Arch Linux - 1
+```
+
+The below sed command removes all the lines End with digits.
+
+```
+# sed '/[0-9]$/d' sed-demo-1.txt
+
+Linux Operating System
+Unix Operating System
+RHEL
+Red Hat
+Fedora
+debian
+ubuntu
+2 - Manjaro
+```
+
+### 15) How Delete lines that contains Alphabetic Characters from a File?
+
+The below sed command removes all the lines that contains alphabetic characters.
+
+```
+# sed '/[A-Za-z]/d' sed-demo-1.txt
+
+3 4 5 6
+```
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/linux-remove-delete-lines-in-file-sed-command/
+
+作者：[Magesh Maruthamuthu][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://www.2daygeek.com/author/magesh/
+[b]: https://github.com/lujun9972