scripts in /etc/NetworkManager/dispatcher.d will got exec and parameters will be passed to the scripts by NetworkManager.
One of my laptop BIOS is malfunctioning, I have to manually sync the time, and do system upgrade BTW. I am working with a script to automate this task.
Here's the script:
#!/bin/sh
IF=$1
STATUS=$2
if [ "$STATUS"x != 'up'x -o "$(date +%Y)" -gt "2012" ] ;then
exit
fi
logger "==$0=="
wait_for_process(){
PNAME=$1
PID=`pgrep $PNAME`
while [ -z "$PID" ];do
logger "waiting $1 running for another 3 sec.."
sleep 3;
PID=`pgrep $PNAME`
done
logger "$1 is running!"
}
wait_for_process nm-applet
wait_for_process lxpanel
export DISPLAY=$(echo $DISPLAY | cut -c -2)
if [ -z $DISPLAY ];then
export DISPLAY=:0
fi
#below cmd will yield null string for $user
user=$(who | grep "$DISPLAY" | awk '{print $1}' | tail -n1)
#so I have to hardcode the user name:(
user=xxx
export XAUTHORITY="/home/$user/.Xauthority"
logger "Display $DISPLAY user $user"
su $user -c "xterm -e 'sudo /usr/bin/ntpd -qdg && sudo yaourt -Syua' &" || logger "cannot run xterm"
(the script is invoked before x window, run as root)
user=$(who | grep "$DISPLAY" | awk '{print $1}' | tail -n1) cannot find the login user name. But it works in xterm.
Can someone help?
I am using archlinux i686 + openbox + lxpanel
edit:
I want to find the real login user name, while the script is run by root.
Are you looking for the name of the user running the script? How about:
user=$( id -un )
Related
I asked the dark side and here's what it printed.....
#!/bin/bash
for interface in $(ip addr show | awk '/^[0-9]+:/ {print $2}' | tr -d :)
do
if ! ip addr show $interface | awk '/inet / {print $2}' | grep -q . ; then
echo $interface
fi
done
I want to add n+ variable directly so the output will be the interfaces that is not used by the system,
Done
I have these two scripts, one for Linux and one for Mac, I hope they serve you because I have tested them on Linux Ubuntu and Mac.
on linux
#!/bin/bash
# This script will output unused interfaces on Linux
# Get list of all interfaces
interfaces=$(ifconfig -a | grep -o '^[^ ]*:' | tr -d :)
# Loop through each interface
for interface in $interfaces; do
# Check if interface is up
if [[ $(ifconfig $interface | grep -c 'UP') -eq 0 ]]; then
# Output interface name
echo "$interface is unused"
fi
done
on mac
#!/bin/bash
# Get list of all network interfaces
interfaces=$(networksetup -listallnetworkservices | tail -n +2)
# Loop through each interface
for interface in $interfaces; do
# Get the IP address of the interface
ip=$(ipconfig getifaddr "$interface")
# If the IP address is empty, the interface is unused
if [ -z "$ip" ]; then
echo "$interface is unused"
fi
done
#!/bin/bash
count=0
for interface in $(ip addr show | awk '/^[0-9]+:/ {print $2}' | tr -d :)
do
if ! ip addr show $interface | awk '/inet / {print $2}' | grep -q . ; then
free_interfaces[$count]=$interface
count=$((count + 1))
fi
done
case $count in
0)
echo "No usable interface found."
exit 1
;;
1)
DEFIF=${free_interfaces[0]}
echo "The interface $DEFIF will be used."
;;
*)
echo "Available interfaces to select: "
PS3="Press a number to select an interface to use (1-$count): "
select interface in "${free_interfaces[#]}"; do
DEFIF=$interface
break
done
echo "The interface $DEFIF will be used."
;;
esac
i am monitoring the asterisk log file for peers that get offline.
the if part is working correct, but the sed command is not executed in the else part, although the echo command works. What do i need to change
tail -n0 -F /var/log/asterisk/messages | \
while read LINE
do
if echo "$LINE" | /bin/grep -q "is now UNREACHABLE!"
then
EXTEN=$(echo $LINE | /bin/grep -o -P "(?<=\').*(?=\')")
echo "$EXTEN is now UNREACHABLE!"
CALLERID=$(/bin/sed -n '/^\['"$EXTEN"'\]/,/^\[.*\]/{/^callerid*/p}' "$SIP" | /usr/bin/awk -F'=' '{ print $2 }')
if .......
then
.......
fi
elif echo "$LINE" | /bin/grep -q "is now REACHABLE!"
then
EXTEN=$(echo $LINE | /bin/grep -o -P "(?<=\').*(?=\')")
echo "$EXTEN is now REACHABLE!"
if /bin/grep -qi "^$EXTEN;" $OFFLINE; then
/bin/sed -i '/^$EXTEN;/d' $OFFLINE
fi
fi
done
You have a quoting problem - you've used single quotes when the string includes a shell variable:
if /bin/grep -qi "^$EXTEN;" $OFFLINE; then
/bin/sed -i '/^$EXTEN;/d' $OFFLINE
fi
Try using double quotes instead:
if /bin/grep -qi "^$EXTEN;" $OFFLINE; then
/bin/sed -i "/^$EXTEN;/d" $OFFLINE
fi
In a shell script I need to know the value of a variable further down in the code, without running through it first.
This pings $IP which is extracted from $VAR below the while loop.
The $VAR is unknown at the time this is extracted (IP=$(echo $VAR | awk '{print $1}'))
Is it possible to read VAR in before the while loop runs?
The code:
#!/bin/sh
TIMEOUT=10
IP=$(echo $VAR | awk '{print $1}')
while [ $TIMEOUT -ne 0 ];do
ping -c 1 -W 1 "$IP" >/dev/null
rc=$?
if [ $rc -eq 0 ];then
TIMEOUT=0
else
TIMEOUT=$(($TIMEOUT - 1))
echo $TIMEOUT
sleep 1
fi
done
# rest of code to run after while loop
VAR="192.168.0.1 t,r 20,e"
I am working on an existing shell script code which has eval. I feel like that eval is unnecessary here and wanted to remove to avoid Injection.
Could you please check the code and advise why there is an eval in the code.
FILE_PATH=`echo $1 | awk '{ print $10 }' | cut -f2 -d'"'
FILE_PATH=`(eval "echo ${FILE_PATH}")`
if $1 is something like that ---"~/tttttttt.txt.
FILE_PATH will be ~/tttttttt.txt without eval.
but with eval;
FILE_PATH will be /home/user/tttttttt.txt
#!/bin/bash
path='-----"~/tttttttt.txt'
FILE_PATH=`echo $path | awk '{ print $1 }' | cut -f2 -d'"'`
echo "${FILE_PATH}"
ls -lart ${FILE_PATH}
FILE_PATH=`(eval "echo ${FILE_PATH}")`
echo $FILE_PATH
ls -lart ${FILE_PATH}
if run above script, output:
~/tttttttt.txt
ls: cannot access ~/tttttttt.txt: No such file or directory
/home/user/tttttttt.txt
-rw-rw-r-- 1 user user 0 Aug 26 15:54 /home/user/tttttttt.txt
I have the following program below which telnets into another device and prints serial number and Mac address.
My problem is that for some reason if I send the command once it skips the first command and sends the second, but if I copy the same command twice it will send the command.
What is the correct way to send a command multiple commands successively?
Should the buffer be flushed after every command sent ?
My Env
Eclipse Ide
Ubuntu 12.10
perl 5, version 14, subversion 2 (v5.14.2)
Snippet of my code:
$telnet = Net::Telnet->new($remoteSystem);
$| = 1;
$telnet->buffer_empty();
$telnet->buffer_empty();
$result = $telnet->input_log($errorlog);
#$_ = "#lines";
#TSN =$telnet->cmd('export | grep -e SerialNumber..[A-Z] | cut -d"\"" -f2');
#TSN =$telnet->cmd('export | grep -e SerialNumber..[A-Z] | cut -d"\"" -f2');
#mac = $telnet->cmd('ifconfig | grep eth0 | cut -d" " -f 11');
print "#TSN AND #TSN #mac";
print FH "$remoteSystem\n";
print "Telnetting into $remoteSystem .\n"; # Prints names of the tcd
close(telnet);
}
foreach (#host) {
checkStatus($_);
}
OUTPUT That skips the first command:
bash-2.02 AND bash-2.02 ifconfig | grep eth0 | cut -d" " -f 11
00:11:D9:3C:6E:02
bash-2.02 #
bash-2.02 Telnetting into debug79-109 .
OUTPUT That works but I have to send the same command twice:
export | grep -e SerialNumber..[A-Z] | cut -d"\"" -f2
AE20001901E2FD1
bash-2.02 #
bash-2.02 AND export | grep -e SerialNumber..[A-Z] | cut -d"\"" -f2
AE20001901E2FD1
bash-2.02 #
bash-2.02 ifconfig | grep eth0 | cut -d" " -f 11
00:11:D9:3C:6E:02
bash-2.02 #
bash-2.02 Telnetting into debug79-109
Specify the command prompt in your call to cmd(), e.g.#TSN =$telnet->cmd('export | grep -e SerialNumber..[A-Z] | cut -d"\"" -f2', Prompt => 'bash-2.02 #');
Try opening a connection after creating a object for the module telnet
$telnet->open($host);
After which execute waitFor method:(waits until the pattern bash-2.02 # comes)
$telnet->waitFor(/^(bash-\d+.\d+ #)$/);
and then execute your commands , it would give you proper output.