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Tuesday, 16 March 2010 13:42 |
Command wc
Displays the number of bytes, words and lines found in the file.
Syntax
wc [options] [files]
Options
-c displays only the number of bytes.
-w only shows the number of words.
-l displays only the number of rows.
Description
wc command displays the number of bytes, words and lines found in the file. If the input file is not specified, wc reads from standard input.
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Tuesday, 16 March 2010 13:10 |
Command unalias
Eliminates the abbreviation as defined previously by using the alias.
Syntax
unalias abbreviation
Options
no
Description
command unalias removes the abbreviation as defined previously by using the alias. Command unalias is a built-in command processor Bash.
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Tuesday, 16 March 2010 12:55 |
Command touch
Changes the timestamp of file.
Syntax
touch [options] files
Options
-c prescribes not to touch the file if it does not exist.
-d time, using the specified time.
-r file uses a timestamp of the mentioned file.
-t MMDDhhmm uses the specified date and time.
Description
touch command lets you change the date and time of last modification file (this information is stored with the file). When you enter touch without options as timestamp file using current date and time. If the specified file does not There, touch creates a new file size 0 bytes.
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Friday, 19 February 2010 13:51 |
Command tar
Creates archive files or extract files from archives.
Syntax
tar [options] file_or_directory
Options
-c creates a new archive.
-d compares the files from the archive files from the current directory.
-r adds the files in the archive.
-t displays the contents of the archive.
-x extracts files from the archive.
-C directory extracts the files in the specified directory.
-f file read the archive from the specified file.
-L n determines the size of the tape to n kilobytes.
-N date archive only files newer than specified date.
-T file archives or extract files with names listed in the file file.
-v verbose.
-z compresses or decompresses the archive with gzip.
-j compresses or decompresses the archive through bzip2.
Description
The tar command creates an archive file, or extract files from existing archives.
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Friday, 19 February 2010 13:40 |
Command tail
Displays the last few lines of the file.
Syntax
tail [options] file
Options
-N (where N - number) displays the last N lines.
-n N (where N - number) displays the last N lines.
-f reads a file at specified intervals and displays the new line.
Description
tail command displays the last lines of the file. By default last 10 lines of the file.
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