Bash ошибка синтаксиса ожидается операнд

I’m writing a script in bash and I get this error:

./P4.1: line 10: +: syntax error: operand expected (error token is "+")

And this is my code:

#!/bin/bash
read string
echo $string >| temp
num1= cut -d" " -f1 temp
num2= cut -d" " -f2 temp
num3= cut -d" " -f3 temp
while [ $num1 -gt $num3 ]
do
        echo $num1
        num1=$[$num1+$num2]
done

What’s wrong and how do I fix it?
Thanks.

asked Nov 24, 2013 at 16:03

answered Jun 30, 2022 at 1:49

I am getting this error bellow:

Path to the shell file:line 6: ++++: syntax error: operand expected (error token is "+")

and

Path to the shell file:line 13: ((: i <= : syntax error: operand expected (error token is "<= ")

This is my script:

#!/bin/bash  
SCRIPTPATH=$( cd $(dirname $0) ; pwd -P )
file="$SCRIPTPATH/android/sdcard.img"
file2="$SCRIPTPATH/android/devices.txt"

TOTALDEVICES=$(($1+$2+$3+$4+$5))
ANDROID4=0
ANDROID5=0
ANDROID5_1=0
ANDROID6=0
ANDROID7=0
echo $TOTALDEVICES
for ((i = 1; i <= $TOTALDEVICES; i++));

do
   if (($1 > 0 && $ANDROID4 < $1)) 
   then 
   echo "Device$i PACKAGE(avd4.4) 1"
   ANDROID4=$((ANDROID4 + 1))
    echo "no" |~/Android/Sdk/tools/bin/avdmanager create avd -f --package 'system-images;android-19;google_apis;armeabi-v7a' --name "avd4"  --tag 'google_apis' -p $SCRIPTPATH/android/avd4
   fi

   if (($2 > 0 && $ANDROID5 < $2 && $ANDROID4 == $1 && $i > $ANDROID4))
   then 
   echo "Device$i PACKAGE(avd5.0) 2"
   ANDROID5=$((ANDROID5 + 1))
    echo "no" |~/Android/Sdk/tools/bin/avdmanager create avd -f --package 'system-images;android-21;google_apis;armeabi-v7a' --name "avd5"  --tag 'google_apis' -p $SCRIPTPATH/android/avd5
   fi
   if (($3 > 0 && $ANDROID5_1 < $3 && $ANDROID5 == $2 && $i > $ANDROID5 + $ANDROID4))
   then 
   echo "Device$i PACKAGE(avd5.1) 3"
   ANDROID5_1=$((ANDROID5_1 + 1))
    echo "no" |~/Android/Sdk/tools/bin/avdmanager create avd -f --package 'system-images;android-22;google_apis;x86' --name "avd5.1"  --tag 'google_apis' -p $SCRIPTPATH/android/avd5.1
   fi
   if (($4 > 0 && $ANDROID6 < $4 && $ANDROID5_1 == $3 && $i > $ANDROID5_1 + $ANDROID5 + $ANDROID4))
   then 
   echo "Device$i PACKAGE(avd6) 4"
   ANDROID6=$((ANDROID6 + 1))
   echo "no" | ~/Android/Sdk/tools/bin/avdmanager create avd -f --package 'system-images;android-23;google_apis;x86' --name "avd6"  --tag 'google_apis' -p $SCRIPTPATH/android/avd6
   fi
   if (($5 > 0 && $ANDROID7 < $5 && $ANDROID6 == $4 && $i > $ANDROID6 + $ANDROID5_1 + $ANDROID5 + $ANDROID4))
   then 
   echo "Device$i PACKAGE(avd7) 5"
   ANDROID7=$((ANDROID7 + 1))
   echo "no" | ~/Android/Sdk/tools/bin/avdmanager create avd -f --package 'system-images;android-24;google_apis;x86' --name "avd7"  --tag 'google_apis' -p $SCRIPTPATH/android/avd7  
   fi
done

AVDMANAGEROUTPUT=$(~/Android/Sdk/tools/bin/avdmanager list avds | grep "Name:")
AVDMANAGEROUTPUT=${AVDMANAGEROUTPUT//$'n'/} # Remove all newlines.
AVDMANAGEROUTPUT=${AVDMANAGEROUTPUT%$'n'}   # Remove a trailing newline.
DEVICES=()
i=0
IFS=' ' read -r -a array <<< "$AVDMANAGEROUTPUT"
for index in "${!array[@]}"
do
    rem=$(( $index % 2 )) #check for odd number to avoid Name:
    if [ $rem -eq 1 ]
    then
        echo "${array[index]}" #Now put values into an array
        DEVICES[$i]=`echo @"${array[index]}"`
        i=$((i+1))
    fi
done
# Check if the sdcard is available
if [ -f "$file" ]
then
    echo "$file found."
    ~/Android/Sdk/emulator/emulator ${DEVICES[0]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    ~/Android/Sdk/emulator/emulator ${DEVICES[1]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    ~/Android/Sdk/emulator/emulator ${DEVICES[2]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    ~/Android/Sdk/emulator/emulator ${DEVICES[3]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    ~/Android/Sdk/emulator/emulator ${DEVICES[4]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    sleep 110
else
# if there is none,here we are creating one
    echo "$file not found."
    ~/Android/Sdk/emulator/mksdcard 10G "$SCRIPTPATH/android/sdcard.img"
    sleep 5
    ~/Android/Sdk/emulator/emulator ${DEVICES[0]} -sdcard $file  >> "$SCRIPTPATH/emulators.txt" 2>&1 &  
    ~/Android/Sdk/emulator/emulator ${DEVICES[1]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    ~/Android/Sdk/emulator/emulator ${DEVICES[2]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    ~/Android/Sdk/emulator/emulator ${DEVICES[3]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    ~/Android/Sdk/emulator/emulator ${DEVICES[4]} -sdcard $file >> "$SCRIPTPATH/emulators.txt" 2>&1 & #open the emulator
    sleep 110
fi

Line 6 of your script expects arguments 1 to 5 to exist. If you run your script with no arguments $1+$2+$3+$4+$5 will become +++++ which explains the error message. (A similar explanation is valid for the second error message.) Perhaps you should check that 5 arguments have been provided and exit with an error message if this test fails, e. g.:

if [ $# != 5 ]
then
    echo "Usage: scriptname num1 num2 num3 num4 num5"
    exit 2
fi

Alternatively you can provide a default value for missing arguments with Bash’s parameter expansion. In the following expression the first 5 command-line arguments, or 0 in their absence, are added to a sum:

$((${1-0} + ${2-0} + ${3-0} + ${4-0} + ${5-0}))

Note that you should also check that each of the 5 arguments is numeric before attempting to obtain their sum.

I’m still very green with arithmetic in bash. I got some help cleaning up a 2 part query to get a specific value from a linux box i have. However, I now receive a syntax error I can’t seem to piece together. Any help understanding why would be greatly appreciated.

The query is:

echo $(( (2147483633-"$(grep -i isrs /proc/zem0 | grep -Eo '[0-9]+$')")/5184000 ))

and the error comes back as

-bash: (2147483633-"16458074")/5184000 : syntax error: operand expected (error token is ""16458074")/5184000 ")

please help me understand why! thanks so much, in advance!