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Full Discussion: Compare lists of files
Top Forums Shell Programming and Scripting Compare lists of files Post 24779 by keelba on Wednesday 17th of July 2002 03:56:16 PM
Old 07-17-2002
Compare lists of files

If I had a list of numbers in two different files, what would be the fastest and easiest way to find out which numbers in list B are not in list A without reading each number in list B one at a time and using grep thousands of times against list A?

I have two very long lists of numbers and the grep routine is too slow and uses too many resources.

If anyone has any good ideas, I'd sure appreciate it.
 

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ncheck(8)						      System Manager's Manual							 ncheck(8)

NAME
ncheck - lists i-number or tag and path name for files in a local file system. SYNOPSIS
/usr/sbin/ncheck [-i numbers] [-asm] file_spec [file_spec...] PARAMETERS
Specifies one or more file systems. Specify any file system by entering its full path name or its mount point. The full path name is the name entered in the file-spec field of the file system's entry in the /etc/fstab file. The mount point is the name entered in the mnt_point field of the file system's entry in the /etc/fstab file. You can also specify a UFS file system by entering the name of its device special file. For example: /dev/disk/dsk3c. You can also specify an AdvFS fileset by entering the name of the file domain, a pound sign (#) character, and the name of the file- set. For example: root_domain#root. FLAGS
Includes in the list the path names . (dot) and .. (dot dot), which are ordinarily suppressed. Lists only those files with the specified i-numbers (UFS) or tags (AdvFS). If you enter a zero (0) all allocated numbers will be displayed. Includes in the list the mode, UID, and GID of the files. To use this flag you must also specify either the -i or the -s flag on the command line. Lists only the special files and files with set-user-ID mode. DESCRIPTION
The ncheck command with no flags generates a list of all files on every specified file system. The list includes the path name and the corresponding i-number or tag of each file. Each directory file name in the list is followed by a /. (slash dot). Use the available flags to customize the list to include or exclude specific types of files. The files are listed in order by i-number or tag. To sort the list in a more useful format, pipe the output to the sort command. NOTES
The term file_spec represents either a UFS file system or an AdvFS fileset. To uncover concealed violations of security policy, that is, the inappropriate use of the set-user-ID mode, issue the command with the -s flag to list only special files and files with set-user-ID mode. RESTRICTIONS
You must be the root user to use this command. The ncheck command checks the /etc/fstab file for the specified domain and file system entry. If there is no entry in /etc/fstab for the specified file system, an error message is displayed to indicate that the file does not exist. DIAGNOSTICS
When the file system structure is improper, ?? (question mark question mark) denotes the parent of a parentless file. A path name begin- ning with ... (dot dot dot) denotes a loop. ERRORS
The ncheck command can be used only for checking local file systems. The "nnn" string identifies the file system type. FILES
Specifies the command path RELATED INFORMATION
sort(1), quot(8). delim off ncheck(8)
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