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Exit to while read

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# 1  
Old 11-11-2017
Exit to while read
Hi expert,

How do i exit to while read, below is the script.
I need to exit after execute echo or command.

or any scripts that can search two patterns and if they found any patterns execute the command and exit.

Thanks a lot..

Code:
tail -fn0 /tmp/test.log | \
while read line ; do
        echo "$line" | grep -q "Pattern1"
        echo "$line" | grep -q "Pattern2"
    if [ "$line" == "Pattern1" ]
        then
        echo "Pattern1"
		exit
    elif [ "$line" == "Pattern2" ]
        then
        echo "Pattern2"
		exit
    fi
done

# 2  
Old 11-11-2017
exit will exit the script (or shell), and break will exit the while-loop.

You can use grep -E or egrep to search for multiple patterns, using a pipe character to separate the terms, and use the grep return code to see if a match was made.

e.g.
Code:
echo ... | egrep "Pattern1|Pattern2"

Alternatively, you could say:
Code:
if [[ "$line" =~ Pattern1 ]]; then
  ...
  ...
elif [ ... ]; then
  ...
  ...
fi

You'll want to add some word boundaries to any search to prevent false positive results.
# 3  
Old 11-11-2017
tried the break after my echo but the script not break right away, I need to trigger append the pattern again to the /tmp/test.log
# 4  
Old 11-11-2017
To append what? $line?

If so, simply echo that, grepping what need, if required, and redirect that to the log file.
# 5  
Old 11-11-2017
same issue,

Code:
tail -fn0 /tmp/test.log | \
while read line ; do
        echo "$line" | grep -q "Pattern1"
        echo "$line" | grep -q "Pattern2"
if [[ "$line" =~ "patern1" ]]; then
        echo "Pattern1"
		break
elif [[ "$line" =~ "pattern2" ]]; then
        echo "Pattern2"
		break
fi
done

what to achieve is:
creating to monitor /tmp/test.log if they found "pattern1" then execute the command and run the next line or next command or if they found "pattern2" then other command will executed
# 6  
Old 11-11-2017
Well, if you want to monitor the log, it doesn't make much sense to exit (or break) at all.

Code:
tail -fn0 test.log | while read line; do
if [[ "$line" =~ "Pattern1" ]]; then
  # do something here
  echo $line >> test2.log
elif [ "$line" =~ "Pattern2" ]; then
  # do something else here
  echo $line >> test2.log
  fi
done

(ideally this is something you would likely run nohup in the background)
# 7  
Old 11-11-2017
hi Scott,
here my script

Code:
func_monitoring () {
tail -fn0 /tmp/test.log | \
while read line ; do
        echo "$line" | grep -q "pattern1"
        echo "$line" | grep -q "pattern2"
    if [ "$line" == "pattern1" ]
        then
                echo "patter1"
                break
    elif [ "$line" == "pattern2" ]
        then
                echo "patter2"
                break
    fi
done
}

func_menu () {

while :
  do
clear
  echo ""
  echo ""
  echo "               [1] Monitor the log"
  echo ""
  echo "               [2] Exit"
  echo ""
  echo ""
  echo "        Select Number"
  echo ""
  echo -n "        Please Select [1-2]: "
  read yourch
  case $yourch in
   1)  func_monitoring ; read -n 1;;
   2)  clear ; exit 0
       ;;
    *) echo "       Please select choice 1 or 2"
       read -n 1
       ;;
  esac
done
}
func_menu

---------- Post updated at 11:52 AM ---------- Previous update was at 11:51 AM ----------

after found any pattern must be go back to the menu after 5s but is not happening

---------- Post updated at 11:56 AM ---------- Previous update was at 11:52 AM ----------

here's the scripts goes:
screen 1
1. sh test.sh

Code:

               [1] Monitor the log

               [2] Exit


        Select Number

        Please Select [1-2]: 1

from screen 2
will execute this:
echo 'pattern1' >> /tmp/test.log

result
screen 1:

Code:

               [1] Monitor the log

               [2] Exit


        Select Number

        Please Select [1-2]: 1
patter1

is not go back to menu after echo the pattern, i need to go back to the main menu

---------- Post updated at 11:59 AM ---------- Previous update was at 11:56 AM ----------

---------- Post updated at 01:01 PM ---------- Previous update was at 11:59 AM ----------

Thanks scott,

Solved it by adding this:
Code:
		echo "        Please [Enter] key to continue..."
		ps aux |grep tail -m 1 |awk '{print "kill " $2}' |sh
                break

Last edited by lxdorney; 11-11-2017 at 01:59 PM..
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