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Most of us use grep just for finding the words in a file.
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Whenever you want to make changes to the file automatically, sed comes in handy to do this. Sed Command in Unix and Linux Examples Sed is a Stream Editor used for modifying the files in unix (or linux).If you like this article, then please share it or click on the google +1 button. Replace String With Awk / Sed Command in Unix If you dont wish to delete the lines from the original source file you can redirect the output of the sed command to another file. To Remove the lines from the source file itself, use the -i option with sed command. However the sed command does not remove the lines from the source file. Note: In all the above examples, the sed command prints the contents of the file on the unix or linux terminal by removing the lines. If you want to delete Nth line only if it contains a pattern, then in place of $ place the line number. Delete last line only if it contains the pattern > sed '$' file Here the sed command removes the line that matches the pattern fedora and also deletes all the lines to the end of the file which appear next to this matching line.ġ5. Delete lines starting from a pattern till the last line > sed '/fedora/,$d' file Delete lines that contain a pattern > sed '/debian/d' fileġ4. Delete lines which are in upper case or capital letters > sed '/^*$/d' fileġ3. The above command deletes all the lines that end with character ‘x’.ġ2.
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Delete lines that end with specified character > sed '/x$/d' file Above sed command removes all the lines that start with character ‘u’.ġ1. ^ is to specify the starting of the line. Delete lines that begin with specified character > sed '/^u/d' file In the following examples, the sed command deletes the lines in file which match the given pattern.ġ0. Sed Command to Delete Lines – Based on Pattern Match However, this sed do not remove the lines that contain spaces. The ^$ indicates sed command to delete empty lines. Delete empty lines or blank lines > sed '/^$/d' file You can specify the list of lines you want to remove in sed command with semicolon as a delimiter. Here the sed command removes lines other than 2nd, 3rd and 4th. Delete lines other than the specified range > sed '2,4!d' file Delete lines other than last line or footer line > sed '$!d' fileħ. The following sed command removes all the lines except the header line. Use the negation (!) operator with d option in sed command. Delete lines other than the first line or header line The following sed command deletes the lines ranging from 2 to 4: > sed '2,4d' fileĥ. The sed command removes the lines from m to n in the file. Here m and n are min and max line numbers. The syntax is shown below: > sed 'm,nd' file The sed command can be used to delete a range of lines. The below sed command removes the second line in a file. The following sed command is used to remove the footer line in a file. Delete last line or footer line or trailer line In the following example, the sed command removes the first line in a file. The syntax for deleting a line is: > sed 'Nd' file The d option in sed command is used to delete a line. In the following examples, the sed command removes the lines in file that are in a particular position in a file. Sed Command to Delete Lines – Based on Position in File The following file contains a sample data which is used as input file in all the examples: > cat file
#SED FIND WORD IN FILE HOW TO#
Here we will see how to delete lines using sed command with various examples. Sed Command to Delete Lines: Sed command can be used to delete or remove specific lines which matches a given pattern or in a particular position in a file.