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Shell Programming and Scripting
Help with NAWK regular expressions
Post 302247681 by vamsi.coe on Thursday 16th of October 2008 07:43:17 AM
10-16-2008
Help with NAWK regular expressions
I've a file
$ cat size
1234
5678
vamsi
I want to match the lines which has just 4 digits and nothing else.
So
$ cat size | nawk ' $0 ~ /[0-9][0-9][0-9][0-9]/ {print}'
1234
5678
But when I use the repetition clause it doesn't work
cat size | nawk ' $0 ~ /[0-9]{4}/ {print}'
I actually want to filter out the lines with just 9 digits , but in a elegant manner.
Of course, /[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]/ will work, but is there any other possible way?? Thanks in advance!!
$ cat size
1234
5678
vamsi
I want to match the lines which has just 4 digits and nothing else.
So
$ cat size | nawk ' $0 ~ /[0-9][0-9][0-9][0-9]/ {print}'
1234
5678
But when I use the repetition clause it doesn't work
cat size | nawk ' $0 ~ /[0-9]{4}/ {print}'
I actually want to filter out the lines with just 9 digits , but in a elegant manner.
Of course, /[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]/ will work, but is there any other possible way?? Thanks in advance!!
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LEARN ABOUT OPENSOLARIS
gnomevfs-cat
gnomevfs-cat(1) User Commands gnomevfs-cat(1) NAME
gnomevfs-cat - print a file to standard output using the VFS system SYNOPSIS
gnomevfs-cat URI DESCRIPTION
gnomevfs-cat is obsolete. It has been superseded by gvfs-cat. See gvfs-cat(1). gnomevfs-cat prints a file to standard output using the virtual file system to access the file via a URI. OPERANDS
The following operands are supported: URI Specifies the file location in standard URI format. EXAMPLES
Example 1: Cat a File From a Web Server example% gnomevfs-cat http://www.sun.com Example 2: Cat a Local File example% gnomevfs-cat file:///home/user/README.txt ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables: NLSPATH. EXIT STATUS
The exit value 0 is returned regardless of success or failure. FILES
The following files are used by this application: /usr/bin/gnomevfs-cat Executable to print a file to standard output using the VFS system ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWgnome-vfs | +-----------------------------+-----------------------------+ |Interface stability |Obsolete Volatile | +-----------------------------+-----------------------------+ SEE ALSO
gnomevfs-copy(1), gnomevfs-info(1), gnomevfs-ls(1), gnomevfs-mkdir(1), gvfs-cat(1), attributes(5), environ(5) NOTES
Written by Stephen Browne, Sun Microsystems Inc., 2004. SunOS 5.11 14 May 2008 gnomevfs-cat(1)