head
Last Updated on Sunday, 19 December 2010 10:01
| Article Index |
|---|
| 1. Name |
| 2. Synopsis |
| 3. Frequently used options |
| 4. Examples |
1. Name
head [man page] - output the first part of files
2. Synopsis
head [OPTION]... [FILE]...
3. Frequently used options
-c, --bytes=[-]N
print the first N bytes of each file; with the
leading `-', print all but the last N bytes of
each file
-n, --lines=[-]N
print the first N lines instead of the first 10;
with the leading `-', print all but the last N
lines of each file
4. Examples
Command head will by default print first 10 lines of a file. Lets prove it by creating test file from /etc/services which contains line numbers.
$ cat /etc/services | nl > /tmp/services.txt
$ head /tmp/services.txt
with -n option we can instruct head command to print line numbers.
$ head -n /tmp/services.txt
make head command to print first 5 lines:
$ head -5 /tmp/services.txt
Same as with option -n with option -c we can print out number of bytes to the standard output. Lets do small test:
$ wc -l -c services.txt
$ head -c 22173 /tmp/services.txt | wc -l
Share this linux post:
Please visit our new Linux Forum for additional help or discussion.
| Linux eBooks FREE Download | ||||
|
|
|
|
|