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Homework and Emergencies Homework & Coursework Questions UNIX shell scripting programming in files Post 303002458 by bakunin on Thursday 24th of August 2017 02:21:29 PM
Old 08-24-2017
Quote:
Originally Posted by mounica bijjala
Code:
grep -f file1 file2

So far, so good. Notice, though, that every file has a "short address" (the files name) and a "long address" (the fies name and its full path).

This works similar to telephone numbers: if you give someone your number without a regional area code and country code it will work as long as the person is in the same area as you.
Code:
123 456 789

But once outside this area you need to give him your area code too to make it work
Code:
0123 / 123 456 789

and to make sure the number works from whereever he is you will have to add the country code too:

Code:
+123 (123)  123 456 789

The same is true for files: you can address them by their name only, but then you will only find them if you happen to be in the same directory. If you aren't you won't. To make sure you find them regardless of where you are provide a full pathname instead. In this case the files name is not
Code:
file1

but rather
Code:
/some/directory/where/to/find/file1

As a general rule: to make sure files are always found regardless of from where you call a script use always the long form of (so-called) "absolute path names" when you address files inside scripts.

I hope this helps.

bakunin
 

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comm(1) 							   User Commands							   comm(1)

NAME
comm - select or reject lines common to two files SYNOPSIS
comm [-123] file1 file2 DESCRIPTION
The comm utility reads file1 and file2, which must be ordered in the current collating sequence, and produces three text columns as output: lines only in file1; lines only in file2; and lines in both files. If the input files were ordered according to the collating sequence of the current locale, the lines written will be in the collating sequence of the original lines. If not, the results are unspecified. OPTIONS
The following options are supported: -1 Suppresses the output column of lines unique to file1. -2 Suppresses the output column of lines unique to file2. -3 Suppresses the output column of lines duplicated in file1 and file2. OPERANDS
The following operands are supported: file1 A path name of the first file to be compared. If file1 is -, the standard input is used. file2 A path name of the second file to be compared. If file2 is -, the standard input is used. USAGE
See largefile(5) for the description of the behavior of comm when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes). EXAMPLES
Example 1: Printing a list of utilities specified by files If file1, file2, and file3 each contain a sorted list of utilities, the command example% comm -23 file1 file2 | comm -23 - file3 prints a list of utilities in file1 not specified by either of the other files. The entry: example% comm -12 file1 file2 | comm -12 - file3 prints a list of utilities specified by all three files. And the entry: example% comm -12 file2 file3 | comm -23 -file1 prints a list of utilities specified by both file2 and file3, but not specified in file1. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of comm: LANG, LC_ALL, LC_COLLATE, LC_CTYPE, LC_MESSAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 All input files were successfully output as specified. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
cmp(1), diff(1), sort(1), uniq(1), attributes(5), environ(5), largefile(5), standards(5) SunOS 5.10 3 Mar 2004 comm(1)
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