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.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi All,
Need the help in getting the file list which are generated for the time period.
example if i want to get the list of file generated between 11 to 12 clock.
i used the find command search the files with -cmin flag with -60.
find /home/test/* -cmin -60 -type f -exec ls {} \;
... (2 Replies)
Discussion started by: nmadhuhb
2 Replies
2. UNIX for Dummies Questions & Answers
I have two very large datasets (>100MB) in a simple vertical list format. They are of different size and with different order and formatting (e.g. whitespace and some other minor cruft that would thwart easy regex).
Let's call them set1 and set2.
I want to check set2 to see if it contains... (2 Replies)
Discussion started by: uiop44
2 Replies
3. Shell Programming and Scripting
File_A contains Strings:
a
b
c
d
File_B contains Strings:
a
c
z
Need to have script written in either sh or ksh. Derive resultant files (File_New_A and File_New_B) from lists File_A and File_B where string elements in File_New_A and File_New_B are listed below.
Resultant... (7 Replies)
Discussion started by: mlv_99
7 Replies
4. UNIX for Dummies Questions & Answers
hello all,
I wonder if anybody might be able to help with this.
I have file 1 and file2.
Both files may contain thousands of lines that have variable contents.
file1
234GH
5234BTW
89er
678tfg
234
234YT
tfg456
wert
78gt
gh23444 (7 Replies)
Discussion started by: Garrred
7 Replies
5. Programming
Hi.
I am trying to write a Python programme that compares two different text files which both contain a list of words. Each word has its own line
worda
wordb
wordc
I want to compare textfile 2 with textfile 1, and if there's a word in textfile 2 that is NOT in textfile 1, I want to... (6 Replies)
Discussion started by: Bloomy
6 Replies
6. Shell Programming and Scripting
Hi,
I do little bash scripting so sorry for my ignorance.
How do I compare if the two variable not match and if they do not match run a command.
I was thinking a for loop but then I need another for loop for the 2nd list and I do not think that would work as in the real world there could... (2 Replies)
Discussion started by: GermanJulian
2 Replies
7. Shell Programming and Scripting
Hi everybody!
I'm trying to delete some elements from a list with two elements on each row agreeing with the elements in another list. Pratically I want a perl script able to take each element of the second list (that is a single column list), compare it with both elements of each row from the... (3 Replies)
Discussion started by: gabrysfe
3 Replies
8. Shell Programming and Scripting
I have two files A and B listing ip addresses
and all the ip addresses in B are in A, and A includes other ip addresses
now I want to get the list of the ip addresses that are in A but not in B
how to achieve this? thanks (1 Reply)
Discussion started by: esolvepolito
1 Replies
9. Homework & Coursework Questions
Hello,
I'm new to the python programming, and I have a question.
I have to write a program that prints a receipt for a restaurant. The input is a list which looks like:
product1
product3
product8
....
In the other input file there is a list which looks like:
product1 coffee 5,00... (1 Reply)
Discussion started by: dagendy
1 Replies
10. Shell Programming and Scripting
I have a tar arcive
arch_all.tar.gz
and 4 batched tar archive . These batches are supposed to have all the files form arch1.all.tar.gz
arch1_batch1.tar.gz
arch1_batch2.tar.gz
arch1_batch3.tar.gz
arch1_batch4.tar.gz
my issue is that the directory structure in "arch_all.tar.gz" is... (6 Replies)
Discussion started by: sumang24
6 Replies
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)