How to get lines with only one occurence of pattern?
My data
To get lines with more than one MODE I do this:
Now I need to get only lines with single occurrence of MODE. Before I start writing an awk counting these MODE keywords, is there a "proper" way with just a regular expression?
Hi
I need a perl onliner which seaches a line starting with a pattern(last occurence) and display it.
similar to
grep 'pattern' filename | tail -1 in UNIX
Ex: I want to display the line starting with "cool" and which is a last occurence
adadfadafadf
adfadadf
cool dfadfadfadfara... (4 Replies)
I would like to use sed to replace one occurence of a pattern in a file. When I use the s/// command it replaces all occurences of the pattern in the file. Should I be using something other than sed?
Thanks (6 Replies)
hi,
is it possible to find the number of occurences of a pattern between two paranthesis.
for e.g
i have a file as below.
>>{
>>hi
>>GoodMorning
>>how are you?
>>}
>>is it good,
>>tell me yes, if it is good
In the above file, its clear the occurence of word "Good"... (17 Replies)
Hi
I have to replace a pattern found in the first uncommented line in a file. The challenge I'm facing is there are several such similar lines but I have to edit only the first uncommented line.
Eg:
#this is example
#/root/xyz:Old_Pattern
/root/xyz:Old_Pattern
/root/xyz:Old_Pattern
... (10 Replies)
Hi,
Do anybody know how to use awk to count the pattern at specific column?
Input file
M2A928K 419 ath-miR159a,gma-miR159a-3p,ptc-miR159a 60 miR235a
.
.
Output file
M2A928K 419 ath-miR159a,gma-miR159a-3p,ptc-miR159a 60 miR235a 3
.
.
I plan to count how many "miR" in column 3... (2 Replies)
Hi,
I have a simple problem but i guess stupid enough to figure it out. i have thousands rows of data. and i need to find match patterns of two columns and print the number of rows. for example:
inputfile
abd abp 123
abc abc 325
ndc ndc 451
mjk lkj... (3 Replies)
I have a large file and many lines are duplicated. I'm trying to delete lines with every second occurrence of a pattern. Did tried searching similar question but no luck.
I can delete all lines matching pattern with :g/pattern/d but don't want to lose data.
Sample pattern to delete... (6 Replies)
Hello.
Here is a file contents :
declare -Ax NEW_FORCE_IGNORE_ARRAY=(="§" ="§" ="§" ="§" ="§" .................. ="§"Here is a pattern
=I want to extract 'NEW_FORCE_IGNORE_ARRAY' which is the whole word before the first occurrence of pattern '='
Is there a better solution than mine :... (3 Replies)
Discussion started by: jcdole
3 Replies
LEARN ABOUT REDHAT
set_constraints
SET CONSTRAINTS(7) SQL Commands SET CONSTRAINTS(7)NAME
SET CONSTRAINTS - set the constraint mode of the current transaction
SYNOPSIS
SET CONSTRAINTS { ALL | constraint [, ...] } { DEFERRED | IMMEDIATE }
DESCRIPTION
SET CONSTRAINTS sets the behavior of constraint evaluation in the current transaction. In IMMEDIATE mode, constraints are checked at the
end of each statement. In DEFERRED mode, constraints are not checked until transaction commit.
Note: This command only alters the behavior of constraints within the current transaction. Thus, if you execute this command outside
of an explicit transaction block (such as one started with BEGIN), it will not appear to have any effect. If you wish to change the
behavior of a constraint without needing to issue a SET CONSTRAINTS command in every transaction, specify INITIALLY DEFERRED or INI-
TIALLY IMMEDIATE when you create the constraint.
When you change the mode of a constraint to be IMMEDIATE , the new constraint mode takes effect retroactively: any outstanding data modifi-
cations that would have been checked at the end of the transaction (when using DEFERRED) are instead checked during the execution of the
SET CONSTRAINTS command.
Upon creation, a constraint is always give one of three characteristics: INITIALLY DEFERRED, INITIALLY IMMEDIATE DEFERRABLE, or INITIALLY
IMMEDIATE NOT DEFERRABLE. The third class is not affected by the SET CONSTRAINTS command.
Currently, only foreign key constraints are affected by this setting. Check and unique constraints are always effectively initially immedi-
ate not deferrable.
COMPATIBILITY
SQL92, SQL99
SET CONSTRAINTS is defined in SQL92 and SQL99. The implementation in PostgreSQL complies with the behavior defined in the standard, except
for the PostgreSQL limitation that SET CONSTRAINTS cannot be applied to check or unique constraints.
SQL - Language Statements 2002-11-22 SET CONSTRAINTS(7)