Thread: While loop executing even though variables are equal

Not sure why I can't get this while loop to work. Even when the condition(wifi network is MyWifi) the while loop continues to execute. I am a n00b. What am I doing wrong?

Code:

AIRPORT="en0"; #may be en0, use networksetup -listallhardwareports to check
WIFI= /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | awk '/ SSID/ {print substr($0, index($0, $2))}';


echo $WIFI
while [  '$WIFI' != "MyWifi" ];
do
    echo $WIFI
    networksetup -setairportpower $AIRPORT off
    networksetup -setairportpower $AIRPORT on
    WIFI= networksetup -getairportnetwork en0
    sleep 10
    echo $WIFI
done

Change from:

Code:

while [  '$WIFI' != "MyWifi" ];

To (note double quotes around $WIFI):

Code:

while [ "$WIFI" != "MyWifi" ];

Originally Posted by nixcraft

Change from:

Code:

while [  '$WIFI' != "MyWifi" ];

To (note double quotes around $WIFI):

Code:

while [ "$WIFI" != "MyWifi" ];

No change. Any other thoughts, anyone?

Code:

AIRPORT="en0"; #may be en0, use networksetup -listallhardwareports to check
WIFI=$(/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | awk '/ SSID/ {print substr($0, index($0, $2))}')
# no spaces around equal sign
# command substitution needed

echo "$WIFI"

while test "$WIFI" != "MyWifi"
do
    echo "$WIFI"
    networksetup -setairportpower $AIRPORT off
    networksetup -setairportpower $AIRPORT on
    WIFI=$(networksetup -getairportnetwork en0)
    sleep 10
    echo $WIFI
done

Originally Posted by Watael

Code:

AIRPORT="en0"; #may be en0, use networksetup -listallhardwareports to check
WIFI=$(/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | awk '/ SSID/ {print substr($0, index($0, $2))}')
# no spaces around equal sign
# command substitution needed

echo "$WIFI"

while test "$WIFI" != "MyWifi"
do
    echo "$WIFI"
    networksetup -setairportpower $AIRPORT off
    networksetup -setairportpower $AIRPORT on
    WIFI=$(networksetup -getairportnetwork en0)
    sleep 10
    echo $WIFI
done

AWWWWWWWWWWWWWW YEAAAAAAAAAAAAAAHHHH!!! You got me working! Thanks much!

Note that Single quotes will literally interpret the contents, whereas Double quotes will interpret variables or other special symbols inside.