05-14-2004
How can I get an if statement to execute based on number of lines in a file?
I need to have an if statement in a script to run if there are certain processes running. Easiest way I can see to do this is to run a ps and grep the results based on what I am looking for:
$ ps -ef | grep wtrs
---
webtrend 5046 1 0 May 12 ? 0:28 /webtrends/versions/6.1/wtrs_ui -start
---
webtrend 5030 1 0 May 12 ? 3:29 /webtrends/versions/6.1/wtrs -start
---
webtrend 3550 5030 25 07:03:40 ? 91:09 /webtrends/versions/6.1/wtrs 314 -child
---
webtrend 6473 3999 0 09:10:08 pts/4 0:00 grep wtrs
---
webtrend 4409 5030 11 07:35:54 ?60:29 /webtrends/versions/6.1/wtrs 315 -child
("--" added in as line seperators)
Normally, I would expect to see the first, second, and fourth lines. That means everything is running normally. The third and fifth lines in that example are present because the program (wtrs) is currently executing certain commands.
So, what I want to do is an if statement that says (in English):
If wtrs is present in the above example 3 or fewer times, execute the following commands, otherwise do something else.
So what I was thinking of doing was first sending the output of the ps command into a text file:
$ ps -ef | grep wtrs > test.txt
Then the if statement could say:
If test.txt < 4 lines long, execute.
Anyone know how something like that would be possible, or if it would even be possible?
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LEARN ABOUT REDHAT
execute
EXECUTE(7) SQL Commands EXECUTE(7)
NAME
EXECUTE - execute a prepared query
SYNOPSIS
EXECUTE plan_name [ (parameter [, ...] ) ]
INPUTS
plan_name
The name of the prepared query to execute.
parameter
The actual value of a parameter to the prepared query. This must be an expression yielding a value of a type compatible with the
data-type specified for this parameter position in the PREPARE statement that created the prepared query.
DESCRIPTION
EXECUTE is used to execute a previously prepared query. Since prepared queries only exist for the duration of a session, the prepared query
must have been created by a PREPARE statement executed earlier in the current session.
If the PREPARE statement that created the query specified some parameters, a compatible set of parameters must be passed to the EXECUTE
statement, or else an error is raised. Note that (unlike functions) prepared queries are not overloaded based on the type or number of
their parameters: the name of a prepared query must be unique within a database session.
For more information on the creation and usage of prepared queries, see PREPARE [prepare(7)].
COMPATIBILITY
SQL92
SQL92 includes an EXECUTE statement, but it is only for use in embedded SQL clients. The EXECUTE statement implemented by PostgreSQL also
uses a somewhat different syntax.
SQL - Language Statements 2002-11-22 EXECUTE(7)