Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

$((...)) and $[...] comparison

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting $((...)) and $[...] comparison
# 8  
Old 12-21-2009
Quote:
Does $((mathematical expression)) and $[mathematical expression] mean the same?
A minor nitpick. $((...)) does not necessarily imply a mathematical expression. The following is perfectly valid
Code:
echo $((echo hi);(echo there))

This example is included in the IEEE 1003.1-2008 rationale.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help about comparison

Hello folks, I have two files, which have usernames, I want to see the contents of file1.txt which is missing in file2.txt and another comparison file2.txt contents which is missing in file1.txt. please suggest. file1.txt user u2 u8 a9 p9 p3 u4 z8 aaa ahe oktlo (7 Replies)
Discussion started by: learnbash
7 Replies

2. UNIX for Dummies Questions & Answers

date comparison

Hi friends, I would like to compare two dates in an IF statement. This is what I am trying, but it doesn't work. date=20120122 minus=6 if ; then ... fi what would the IF clause looks like? Thanks! :) (5 Replies)
Discussion started by: kokoro
5 Replies

3. UNIX for Dummies Questions & Answers

comparison

hi guys i need a program that can compare a value read from a com-port and one from the terminal. can somebody help me??? using linux kernel 2.6.14-M5 can only use standard function in sh and bash... (5 Replies)
Discussion started by: metal005
5 Replies

4. Shell Programming and Scripting

String Comparison

Is there a way to compare the permission string of two files and output the string if they match? For ex: -rw-r--r-- 1 user newuser 0 2009-03-12 16:45 file2 -rw-r--r-- 1 user newuser 0 2009-03-12 16:46 fileone output: -rw-r--r-- If they don't match output will be just... (3 Replies)
Discussion started by: squardius
3 Replies

5. UNIX for Dummies Questions & Answers

Timestamp comparison

How do I compare 2 timestamps (ie... if 2008-02-13 10:48:58.502075 gt 2008-12-15 16:00:00.000000) (4 Replies)
Discussion started by: auzark
4 Replies

6. UNIX for Dummies Questions & Answers

Help with array comparison

I have an array @name with the below contents (index 7 and 8 are names): 1|1|2|2|I|2|0|DUNN|LACY|||||| 2|2|2|2|I|2|0|KOFE|ROGER|||||| 3|3|2|2|A|2|0|KOFOED|ROBERT|||||| 3|4|2|2|A|2|0|KOFOED|ROBERT|||||| 3|5|2|2|A|2|0|KOFOED|ROBERT|||||| 2|7|2|2|I|2|0|WILLIAMSON|JAMES||||||... (4 Replies)
Discussion started by: ChicagoBlues
4 Replies

7. Shell Programming and Scripting

list comparison

what is the easy way to compare checksums of sereral paramters by script: for example: #im creating a file containing a list of checksum parameters cksum /opt/LGTOaam51/data_source_types/UX_File_System/* > t1 #and another one cksum /opt/LGTOaam51/data_source_types/UX_File_System2/* > t2 ... (2 Replies)
Discussion started by: modcan
2 Replies

8. Shell Programming and Scripting

file comparison

hi I have 2 files to comapre ,in file a sible column it is numbers,in file b2 numbers and other values with coma separated. i want compare numbers in file a with file b,and the out put put should be in C with numbers in both file a and b along with other columns of file b. i used folowing... (7 Replies)
Discussion started by: satish.res
7 Replies

9. Shell Programming and Scripting

need some help..Comparison

I need some help which would probably be for most of you a simple script. I need to read in the data from a .dat file and then compare avg to see who is the highest avg. Here is my script so far. #!/bin/ksh #reading in the data from lab3.dat filename=$1 while read name o1 o2 o3 o4 o5 o6... (0 Replies)
Discussion started by: bluesilo
0 Replies

10. Filesystems, Disks and Memory

comparison

can anyone point me to a comparison of *nix file systems ? i think i prefer a journalling fs but i would like to see a comparison between several fs's before i make up my mind (2 Replies)
Discussion started by: cnf
2 Replies
Login or Register to Ask a Question

LEARN ABOUT SUSE

ausearch_add_expression

AUSEARCH_ADD_expression(3)					  Linux Audit API					AUSEARCH_ADD_expression(3)

NAME

       ausearch_add_expression - build up search expression

SYNOPSIS

       #include <auparse.h>

       int ausearch_add_expression(auparse_state_t *au, const char *expression, char **error, ausearch_rule_t how);

DESCRIPTION

       ausearch_add_item  adds	an expression to the current audit search expression.  The search conditions can then be used to scan logs, files,
       or buffers for something of interest.  The expression parameter contains an expression, as specified in ausearch-expression(5).

       The how parameter determines how this search expression will affect the existing search expression, if one is already defined.  The  possi-
       ble values are:

	      AUSEARCH_RULE_CLEAR
		     Clear the current search expression, if any, and use only this search expression.

	      AUSEARCH_RULE_OR
		     If a search expression E is already configured, replace it by (E || this_search_expression).

	      AUSEARCH_RULE_AND
		     If a search expression E is already configured, replace it by (E && this_search_expression).

RETURN VALUE

       If  successful,	ausearch_add_expression  returns  0.   Otherwise, it returns -1, sets errno and it may set *error to an error message; the
       caller must free the error message using free(3).  If an error message is not available or can not be allocated, *error is set to NULL.

SEE ALSO

       ausearch_add_item(3), ausearch_add_interpreted_item(3), ausearch_add_timestamp_item(3), ausearch_add_regex(3), ausearch_set_stop(3),  ause-
       arch_clear(3), ausearch_next_event(3), ausearch-expression(5).

AUTHOR

       Miloslav Trmac

Red Hat 							     Feb 2008						AUSEARCH_ADD_expression(3)