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# 1  
Old 04-08-2008
Java question about testing in shell programming
In folder A i have a file "a' and text file named infile00.I would like to do redirection :a<infile01.
There is a code to do this
Code:
#get a file "a" in /home/A
for file in `ls /home/A`
do
     if [ -x file ]
     then
         #printing out if file is an execute file
         echo $file "is an execute file"
         # get an input file named input00 in /home/A
          for input in `ls /home/A`
          do
                 if [ ! -x input ]
                 then
                         home/A/$file<input
                 fi
           done
      fi
done

When i executed the script above, output was
Code:
correct is an execute
infile00 is an execute

I tried to correct the problem but.....the result did not change at all (even got worse)
Can anyone help me out.
# 2  
Old 04-08-2008
To refer to the value of a variable, use $file with a dollar sign. (When you assign to it, there should be no dollar sign.)

You lack a slash in the innermost conditional, you want /home/A not home/A

As a matter of programming idiom, the correct way to loop over the files in a directory is simply

Code:
for file in /home/A/*

This includes the path name in the value of $file; this may or may not be what you want. To prune it off, use ${file#/home/A/}
Last edited by era; 04-08-2008 at 04:53 AM.. Reason: Remark about including and pruning directory name
# 3  
Old 04-09-2008
Quote:
Originally Posted by era
To prune it off, use ${file#/home/A/}
What does it (i.e) "${file#/home/A/}" actually do? I tried with my home directory, but the variable 'file' shows empty.
What is the meaning of 'prune it off'?
# 4  
Old 04-09-2008
Read the documentation for your shell. This construct removes the leading string after the # from the value, if present.
# 5  
Old 04-09-2008
Quote:
Originally Posted by era
Read the documentation for your shell. This construct removes the leading string after the # from the value, if present.
Suppose, the 'file' variable contains the following data:
file=/home/A/cppfiles/src

giving the command:
echo ${file#/home/A/} ==> cppfiles/src

do you mean this? Is this called "prune it off"?
# 6  
Old 04-09-2008
File 'cmd' (executable)
Code:
#!/bin/ksh
# Get an executable file in $*

list_dir=$(ls $*)

for file in $list_dir
do
     if [ -x $file ]
     then
         #printing out if file is an execute file

         echo "File $file is an execute file"

         # get a non-executable input file in $1

          for zfile in $list_dir
          do
                 if [ ! -x $zfile ]
                 then
                        echo "File $zfile is a data file"
                        $file < $zfile
                 fi
           done
      fi
done

File 'a' (executable)
Code:
#!/bin/ksh

echo "Hello, I'm the 'a' file !"
echo "Here is my input:"

while read n
do
        echo $n
done

echo "End of file 'a'"

File 'input00' (non executable)
Code:
- this
- is
- the
- input
- of
- the
- file
- intput00

File 'input01' (non executable)
Code:
- this
- is
- the
- input
- of
- the
- file
- intput01

Execute:
Code:
./cmd A/*
File A/a is an execute file
File A/input00 is a data file
Hello, I'm the 'a' file !
Here is my input:
- this
- is
- the
- input
- of
- the
- file
- intput00
End of file 'a'
File A/input01 is a data file
Hello, I'm the 'a' file !
Here is my input:
- this
- is
- the
- input
- of
- the
- file
- intput01
End of file 'a'

Smilie
# 7  
Old 04-09-2008
Quote:
Originally Posted by royalibrahim
Suppose, the 'file' variable contains the following data:
file=/home/A/cppfiles/src

giving the command:
echo ${file#/home/A/} ==> cppfiles/src

do you mean this? Is this called "prune it off"?
It's not like that's the formal term for this, but yes, that's what I meant.
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