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Shell Programming and Scripting
While read line loop
Post 302952900 by RudiC on Monday 24th of August 2015 07:43:10 AM
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Hi,
I am trying to read a file line by line inside of a while loop. This while loop is part of a here document.
while read line
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#!/bin/bash
count=1
while read line
do
if (($count > 4)); then
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else
echo $line
fi
count=$((count+1))
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INPUT:
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....
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Hello,
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while IFS=: read -r line
do
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LEARN ABOUT SUNOS
volmgt_check
volmgt_check(3VOLMGT) Volume Management Library Functions volmgt_check(3VOLMGT) NAME
volmgt_check - have Volume Management check for media SYNOPSIS
cc [ flag ... ] file ... -lvolmgt [ library ... ] #include <volmgt.h> int volmgt_check(char *pathname); DESCRIPTION
This routine asks Volume Management to check the specified pathname and determine if new media has been inserted in that drive. If a null pointer is passed in, then Volume Management will check each device it is managing that can be checked. If new media is found, volmgt_check() tells Volume Management to initiate any "actions" specified in /etc/vold.conf (see vold.conf(4)). RETURN VALUES
This routine returns 0 if no media was found, and a non-zero value if any media was found. ERRORS
This routine can fail, returning 0, if a stat(2) or open(2) of the supplied pathname fails, or if any of the following is true: ENXIO Volume Management is not running. EINTR An interrupt signal was detected while checking for media. EXAMPLES
Example 1: Checking If Any New Media Is Inserted To check if any drive managed by Volume Management has any new media inserted in it: if (volmgt_check(NULL)) { (void) printf("Volume Management found media "); } This would also request Volume Management to take whatever action was specified in /etc/vold.conf for any media found. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
cc(1B), volcheck(1), vold(1M), open(2), stat(2), volmgt_inuse(3VOLMGT), volmgt_running(3VOLMGT), vold.conf(4), attributes(5), volfs(7FS) NOTES
Volume Management must be running for this routine to work. Since volmgt_check() returns 0 for two different cases (both when no media is found, and when an error occurs), it is up to the user to to check errno to differentiate the two, and to ensure that Volume Management is running. SunOS 5.10 31 Dec 1996 volmgt_check(3VOLMGT)