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-   -   -eq: unary operator expected (https://www.linuxquestions.org/questions/puppy-71/eq-unary-operator-expected-4175544991/)

Fixit7 06-10-2015 09:31 AM
-eq: unary operator expected
 
Code:
value= [ -e /mnt/sda1/Windows_XP_Partition ]
if [ $value -eq 1 ]
then
  echo "XP Part is present"
else
  echo "I didn't find the XP Part"
fi
I do not understand this error message.

Quote:
# ifelse.sh
/root/Scripts/ifelse.sh: line 8: [: -eq: unary operator expected
I didn't find the XP Part

schneidz 06-10-2015 09:33 AM
what does value equal ?

edit: this worx for me:
Code:
schneidz@xbmc:~/tmp$ cat fixit.ksh
#!/bin/bash

[ -e /mnt/sda1/Windows_XP_Partition ]
if [ $? -eq 0 ]
then
  echo "XP Part is present"
else
  echo "I didn't find the XP Part"
fi
schneidz@xbmc:~/tmp$ ./fixit.ksh
I didn't find the XP Part

Fixit7 06-10-2015 09:49 AM
How do I find out what value = ?

When run in a console, there is no error message
for

Quote:
[ -e /mnt/sda1/Windows_XP_Partition ]

schneidz 06-10-2015 09:53 AM
Quote:
Originally Posted by Fixit7 (Post 5375106)
How do I find out what value = ?
Code:
echo value = \"$value\"

Fixit7 06-10-2015 10:03 AM
Quote:
echo value = "$value"
gives

Quote:
value = ""

schneidz 06-10-2015 10:11 AM
^ so since the -eq operator expects one number and nothing ("") is not a number, the if statement exits with an error.

Fixit7 06-10-2015 10:19 AM
When I run this with sda1 mounted and unmounted, the FILE values are correct.

Yet there is no message that the file was not found. ??

Quote:
FILE=/mnt/sda1/menu.lst

# Check if $FILE exists or not on the Windows partition
if test ! -f "$FILE"
then
echo "Error - $FILE not found."
exit 1
fi
echo value = "$FILE"

Fixit7 06-10-2015 10:27 AM
The -e fixed it. :-)

Quote:
if test ! -e "$FILE"
Quote:
#!/bin/bash
#
# Perform an action based on whether a file exists
# Much help from schneidz
clear
FILE=/mnt/sda1/menu.lst
# Check if File exists or not
if test ! -e "$FILE"
then
echo "Error - $FILE not found."
else
echo "$FILE found."
thunar /mnt/sda1/

fi
I wonder what a regular file is ?

-
Quote:
e FILE
FILE exists
-f FILE
FILE exists and is a regular file


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