How do you print the first and last line in Unix?

How do I print the last line of a file in Unix?

7 different ways to print the last line of a file in Linux

1. The tail is the most common command used. …
2. The END label in awk makes it even more easily. …
3. In sed, $ indicates the last line, and $p tells to print(p) the last line($) only. …
4. Another option in sed is to delete(d) all the lines other than(!) the last line($) which in turn prints only the last line.

How do you print the first line in Unix?

head command example to print first 10/20 lines

1. head -10 bar.txt.
2. head -20 bar.txt.
3. sed -n 1,10p /etc/group.
4. sed -n 1,20p /etc/group.
5. awk ‘FNR <= 10’ /etc/passwd.
6. awk ‘FNR <= 20’ /etc/passwd.
7. perl -ne’1..10 and print’ /etc/passwd.
8. perl -ne’1..20 and print’ /etc/passwd.

18 дек. 2018 г.

How do I print a specific line in Unix?

1. awk : $>awk ‘{if(NR==LINE_NUMBER) print $0}’ file.txt.
2. sed : $>sed -n LINE_NUMBERp file.txt.
3. 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. To print 4th line from the file then we will run following commands.

26 сент. 2017 г.

How do I get the last line in Linux?

To look at the last few lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last number lines of the file.

How do I grep the last line of a file?

You can treat this as a sort of table, in which the first column is the filename and the second is the match, where the column separator is the ‘:’ character. Get last line of each file (prefixed with file name). Then, filter output based on pattern. An alternative to this could be done with awk instead of grep.

How do I get the last 100 lines of a file in Unix?

The tail command is a command-line utility for outputting the last part of files given to it via standard input. It writes results to standard output. By default tail returns the last ten lines of each file that it is given. It may also be used to follow a file in real-time and watch as new lines are written to it.

How do you grep the first 10 lines?

head -n10 filename | grep … head will output the first 10 lines (using the -n option), and then you can pipe that output to grep . You can use the following line: head -n 10 /path/to/file | grep […]

How do I read the first line of a file?

Use file. readline() to read a single line from a file

Call file. readline() to get the first line of the file and store this in a variable first_line . Create a second variable, last_line , and iterate through all lines in the file until the end.

How do I copy the first 10 files in UNIX?

Copy the first n files from one directory to another

1. find . – maxdepth 1 -type f | head -5 | xargs cp -t /target/directory. This looked promising, but failed because osx cp command doesn’t appear to have the. -t switch.
2. exec in a few different configurations. This probably failed for syntax problems on my end : / I couldn’t seem to get a head type selection working.

13 сент. 2018 г.

How do I show the number of lines in a file in Unix?

How to Count lines in a file in UNIX/Linux

1. The “wc -l” command when run on this file, outputs the line count along with the filename. $ wc -l file01.txt 5 file01.txt.
2. To omit the filename from the result, use: $ wc -l < file01.txt 5.
3. You can always provide the command output to the wc command using pipe. For example:

How do I print a particular line in Linux?

Print a single specific line

The “head -x” part of the command will get the first x lines of the files. It will then redirect this output to the tail command. The tail command will display all the lines starting from line number x.

How do you show the range of a line in Unix?

EDIT:- Just to add explanation, you use head -n 16482 to display first 16482 lines then use tail -n 258 to get last 258 lines out of the first output. e.g. The $ means “last line”, so the first command makes sed print all lines starting with line 16224 and the second command makes sed quit after printing line 16428 .

How do I see the last 10 lines in Linux?

Linux tail command syntax

Tail is a command which prints the last few number of lines (10 lines by default) of a certain file, then terminates. Example 1: By default “tail” prints the last 10 lines of a file, then exits. as you can see, this prints the last 10 lines of /var/log/messages.

How do I get the last 50 lines in Linux?

The tail command displays, by default, the last 10 lines of a text file in Linux. This command can be very useful when examining recent activity in log files. In the picture above you can see that the last 10 lines of the /var/log/messages file were displayed. Another option that you will find handy is the -f option.

How do I copy the last N line in Linux?

1. counting the number of lines in the file, using `cat f. txt | wc -l` and then using head and tail in a pipeline to print out the last 81424 lines of the file (lines #totallines-81424-1 to #totallines).