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file execution confusion

 
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# 1  
Old 02-08-2012
Data file execution confusion
i have a file in a directory
ls -l gives -rwxr-xr--
so i typed the file name to execute it and i got no such file
but when i type . ./filename i can execute it


what does this . ./ do ?Smilie
# 2  
Old 02-08-2012
. ./filename executes filename in the same shell without forking a sub-shell for filename.

If you typed just filename with an intention to execute it, it wouldn't have run. Try either of these:
1. ./filename
2. sh filename
or
3. The one which you already tried . ./filename. But this is discouraged because filename would end up using parameters defined in the current shell too.
# 3  
Old 02-08-2012
i tried sh ./ file name and sh filename i got no error but it didnt run , ./dsenv gives no privilege to execute ...ls gives this -rwxr-xr--
Last edited by mithun1!; 02-08-2012 at 07:34 AM..
# 4  
Old 02-08-2012
Quote:
Originally Posted by mithun1!
i have a file in a directory
ls -l gives -rwxr-xr--
so i typed the file name to execute it and i got no such file
but when i type . ./filename i can execute it


what does this . ./ do ?Smilie
To answer the question:
The first . is equivalent to the source command and balajesuri described what it does.
The ./ tells the shell to look for filename in your current directory.
All unix/linux-shells I know are a bit picky about blanks. Try ./filename without a space between the slash and the filename. EDIT: I saw you edited your last post and fixed that already...
# 5  
Old 02-08-2012
sh ./filename does not throw an error but it does not run, same for sh filename , ./filename says i dont have privilege . only thing that works is . ./filename . i am not able to understand . can you explain the behavious of all this scenarios and . ./filenmae --> what is source command , can you please elaborate
# 6  
Old 02-08-2012
Please post the contents of the script and a brief explanation of what you expect the script to do.

Where "filename" is the name of the script:
Code:
# Contents of the script
cat filename
# Permissions of parent directory
ls -lad .
# Permissions of script
ls -lad filename
# Your account permissions
id
# Your normal login Shell
echo $SHELL
# Your program (and scripts) search path
echo $PATH

# 7  
Old 02-08-2012
Code:
# Contents of the script
#this file sets environmental variables
if [ -z "$APT_ORCHHOME" ]
then
APT_ORCHHOME=/opt/IBM/dev/APP/InformationServer/Server/PXEngine; export APT_ORCHHOME
fi

Code:
# Permissions of parent directory
drwxrwxr-x 39 dsadm dstage 17408 2012-01-26 17:06 .

Code:
# Permissions of script
-rwxr-xr-- 1 dsadm dstage 8841 2011-09-19 11:49 dsenv

Code:
# Your account permissions
uid=1000401(anumit01) gid=1000000(u-users) groups=10002(etldev),1000000(u-users),1000143(etltestdeploy),1000151(etldeploy)

Code:
# Your normal login Shell
/usr/bin/ksh

Code:
# Your program (and scripts) search path   (With extra line breaks to make it fit the page!)
/opt/IBM/dev/APP/InformationServer/Server/PXEngine/grid_enabled.4.2.5:
/opt/IBM/dev/APP/InformationServer/Server/PXEngine/bin:
/opt/IBM/dev/APP/InformationServer/ASBNode/apps/jre/bin:
/opt/teradata/client/13.0/tbuild/bin:/usr/local/bin:/usr/bin:/usr/X11R6/bin:/bin:/usr/games:/opt/gnome/bin:
/usr/lib64/jvm/jre/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin:/opt/quest/bin:
/opt/ibm/db2/V9.5/bin:/db2/db2clt9/sqllib/bin::/opt/ibm/db2/V9.5/lib:/db2/db2clt9/sqllib/adm:
/opt/oracle/product/10.2.0/bin:/opt/teradata/client/13.0/bin:
/opt/ibmll/LoadL/full/bin/:/opt/IBM/dev/APP/InformationServer/Server/DSEngine/bin:/opt/mqm/bin

Last edited by methyl; 02-08-2012 at 09:19 AM.. Reason: insert subheadings and lay it out in a readable manner
 
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