How do I print the nth line in Linux?
M~N with “p” command prints every Nth line starting from line M. For example, 3~2p prints every 2nd line starting from 3rd line as shown below.
How do you read the nth line in Unix?
N is the line number that you want. For example, tail -n+7 input. txt | head -1 will print the 7th line of the file.
…
- tail -n+N | head -1 : 3.7 sec.
- head -N | tail -1 : 4.6 sec.
- sed Nq;d : 18.8 sec.
How do I print the nth line of a file?
Write a bash script to print a particular line from a file
- awk : $>awk ‘{if(NR==LINE_NUMBER) print $0}’ file.txt.
- sed : $>sed -n LINE_NUMBERp file.txt.
- head : $>head -n LINE_NUMBER file.txt | tail -n + LINE_NUMBER Here LINE_NUMBER is, which line number you want to print. Examples: Print a line from single file.
How do I grep a file in Linux?
How to use the grep command in Linux
- Grep Command Syntax: grep [options] PATTERN [FILE…] …
- Examples of using ‘grep’
- grep foo /file/name. …
- grep -i “foo” /file/name. …
- grep ‘error 123’ /file/name. …
- grep -r “192.168.1.5” /etc/ …
- grep -w “foo” /file/name. …
- egrep -w ‘word1|word2’ /file/name.
How do I grep a specific line number in Linux?
The -n ( or –line-number ) option tells grep to show the line number of the lines containing a string that matches a pattern. When this option is used, grep prints the matches to standard output prefixed with the line number.
What is the use of awk in Linux?
Awk is a utility that enables a programmer to write tiny but effective programs in the form of statements that define text patterns that are to be searched for in each line of a document and the action that is to be taken when a match is found within a line. Awk is mostly used for pattern scanning and processing.
How do I split a string in bash?
In bash, a string can also be divided without using $IFS variable. The ‘readarray’ command with -d option is used to split the string data. The -d option is applied to define the separator character in the command like $IFS. Moreover, the bash loop is used to print the string in split form.
What command will print all lines in the file?
Printing Lines from a File using sed
sed “p” command lets us print specific lines based on the line number or regex provided. sed with option -n will suppress automatic printing of pattern buffer/space.
How do I extract a specific line from a text file in Unix?
To extract a range of lines, say lines 2 to 4, you can execute either of the following:
- $ sed -n 2,4p somefile. txt.
- $ sed ‘2,4! d’ somefile. txt.
What is NR in awk command?
NR is a AWK built-in variable and it denotes number of records being processed. Usage : NR can be used in action block represents number of line being processed and if it is used in END it can print number of lines totally processed. Example : Using NR to print line number in a file using AWK.
How do I print a specific line using sed?
In this article of sed series, we will see how to print a particular line using the print(p) command of sed. Similarly, to print a particular line, put the line number before ‘p’. $ indicates the last line. !