When running if condition, getting the following error Post: 302182218

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Top Forums Shell Programming and Scripting When running if condition, getting the following error Post 302182218 by era on Sunday 6th of April 2008 02:31:24 AM

04-06-2008

Registered User

Presumably ${filename[0]} gets expanded into an empty string, and test isn't able to parse that. Remember that unquoted empty strings will simply disappear. Either quote the strings, or append a character before them (or, to be on the safe side, do both -- that's why you frequently see something like if [ X"$string" = X ])

Code:

vnix$ echo $nosuchvariable


vnix$ [ $nosuchvariable -eq 0 -a $nosuchvariable -eq 0 -a $nosuchvariable -eq 0 ]
bash: [: too many arguments

vnix$ [ "$nosuchvariable" -eq 0 -a "$nosuchvariable" -eq 0 -a "$nosuchvariable" -eq 0 ]
bash: [: : integer expression expected

I don't understand why you expect $filename to turn into an array. Your while loop reads one line at a time, and the value you read replaces the previous value for $filename. If you want it to be an array, you need to initialize it in a different way.

Maybe you really mean something like this.

Code:

exec <status.txt
read file1
read file2
read file3

echo "first content of the file is $file1"
echo "second content of the file is $file2"
echo "third content of the file is $file3"  # or do you really mean to print "second" twice?
if [ "$file1" -eq 0 -a "$file2" -eq 0 -a "$file3" -eq 0 ]
then
echo "please execute the step 1, then step 2 and then step3"
elif [ "$file1" -eq 0 ]
then
echo "please execute the step 2 and then step3"
elif [ "$file1" -eq 0 -a "$file2" -eq 0 -a "$file3" -ne 0 ]
then
echo "please execute the last step3"
fi

This will still print an error message if not all the input is numeric (that's the "integer expression expected" case in the example above). You might be better off using a case statement instead; it's much less sensitive to the type of input etc than test (aka "[").

era

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rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a file name containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)

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