"NOTE: A reference to an element that does not exist automatically creates that array element, with the null string as its value."
and...
"Array elements can be assigned values just like awk variables: array[index-expression] = value"
Nothing saying: "if no assignment is made then the value of index-expression is assigned as the value of the element..."
The code ipUnique[ip] = ip; and ipUnique[ip]; are not equivalent.
The first creates array element ip with a null value (if it doesn't already exist) and then assigns it's value to ip.
The second creates array element ip with a value of null only.
The reason the replacement works is the code never uses the value of the array element and this is irrelevant. It could be 1, NULL or equal to the index and the code still works as intended.
Here is a small example that might help to illustrate.
This User Gave Thanks to Chubler_XL For This Post:
Hi,
I have a log file containg records in sequence
<CRMSUB:MSIN=2200380,BSNBC=TELEPHON-7553&TS21-7716553&TS22-7716553,NDC=70,MSCAT=ORDINSUB,SUBRES=ONAOFPLM,ACCSUB=BSS,NUMTYP=SINGLE;
<ENTROPRSERV:MSIN=226380,OPRSERV=OCSI-PPSMOC-ACT-DACT&TCSI-PPSMTC-ACT-DACT&UCSI-USSD;... (17 Replies)
I admin two co-located servers. I built an app that creates subdirectories for users ie www.site.com/username.
one server that works just fine when you hit that url, it sees the index within and does as it should.
I moved the app to my other server running FEDORA 1 i686 standard, cPanel... (3 Replies)
Hello,
I'm working on unix with grep (GNU grep) 2.5.1. I'm going through some of the newer regex syntax using Regular Expression Reference - Advanced Syntax a guide.
ls -aLl /bin | grep "\(x\)"
Which works, just highlights 'x' where ever, when ever.
I'm trying to to get (?:) to work but... (4 Replies)
Hi,
I have a pipe delimited file. I am checking for junk characters ( non printable characters and unicode values).
I am using the following code
grep '' file.txt
But i want to ignore the name fields. For example field2 is firstname so i want to ignore if the junk characters occur... (4 Replies)
Hi,
I need to perform a grep from a file, but ignore any results from the first column.
For simplicity I have changed the actual data, but for arguments sake, I have a file that reads:
MONACO Monaco ASMonaco
MANUTD ManUtd ManchesterUnited
NEWCAS NewcastleUnited
NAC000 NAC ... (5 Replies)
Hi Guys.
I guess I have a very basic query but stuck with it :(
I have a file in which I want to extract particular content. The content is between standard format like :
Verify stats
A=0
B=12
C=34
TEST Failed
Now I want to extract data between "Verify stats" & "TEST Failed" but do... (6 Replies)
Friends,
In the file i am having more then 100 lines like,
File1 had the values like this:
#Example East.server_01=EAST.SERVER_01
East.server_01=EAST.SERVER_01
West.server_01=WEST.SERVER_01
File2 had the values like this:
#Example EAST.SERVER_01=http://yahoo.com... (3 Replies)
Hi,
How to achieve the displaying of sequence no while doing grep for an output.
Ex., need the output like below with the serial no, but not the available line number in the file
S.No Array Lun
1 AABC 7080
2 AABC 7081
3 AADD 8070
4 AADD 8071
5 ... (3 Replies)
Hi,
I want to read a file line by line and exclude the lines that are beginning with special characters. The below code is working fine except when the line starts with hyphen (-) in the file.
for TEST in `cat $FILE | grep -E -v '#|/+' | awk '{FS=":"}NF > 0{print $1}'`
do
.
.
done
How... (4 Replies)
cat /tmp/i.txt
'(ORA-28001|ORA-00100|ORA-28001|ORA-20026|ORA-20025|ORA-02291|ORA-01458|ORA-01017|ORA-1017|ORA-28000|ORA-06512|ORA-06512|Domestic Phone|ENCRYPTION)'
grep -ia 'ORA-\{5\}:' Rep* |grep -iavE `cat /tmp/i.txt`
grep: Unmatched ( or \(
Please tell me why am i getting that (6 Replies)
Discussion started by: jhonnyrip
6 Replies
LEARN ABOUT LINUX
re_exec
RE_COMP(3) Linux Programmer's Manual RE_COMP(3)NAME
re_comp, re_exec - BSD regex functions
SYNOPSIS
#define _REGEX_RE_COMP
#include <sys/types.h>
#include <regex.h>
char *re_comp(char *regex);
int re_exec(char *string);
DESCRIPTION
re_comp() is used to compile the null-terminated regular expression pointed to by regex. The compiled pattern occupies a static area, the
pattern buffer, which is overwritten by subsequent use of re_comp(). If regex is NULL, no operation is performed and the pattern buffer's
contents are not altered.
re_exec() is used to assess whether the null-terminated string pointed to by string matches the previously compiled regex.
RETURN VALUE
re_comp() returns NULL on successful compilation of regex otherwise it returns a pointer to an appropriate error message.
re_exec() returns 1 for a successful match, zero for failure.
CONFORMING TO
4.3BSD.
NOTES
These functions are obsolete; the functions documented in regcomp(3) should be used instead.
SEE ALSO regcomp(3), regex(7), GNU regex manual
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 1995-07-14 RE_COMP(3)