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Reading ls -l output line by line awk the user name and su user to run commands

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Top Forums Shell Programming and Scripting Reading ls -l output line by line awk the user name and su user to run commands
# 8  
Old 11-12-2013
IBM
Smilie Thanks Made in Germany and Carlos for your input... Now I understand what Carlos meant... Yes echoing the $line works ... That was confusing me as why the why loop goes into the awk subshell...you guys cleared that.

For this script I will use variables as suggested by Don as that is a simpler approach.

regarding the additional checks that you proposed </dev/null work fine but I run into some issues using -f option for su and the 'ticks'... With -f option for su it looks like I can't use -R for chmod(my original script did not have -R for chmod but now I added it) and I get

Code:
-R: 0403-010 A specified flag is not valid for this command.

With the 'ticks' looks like it can't resolve the variable(which is what i thought)

Code:
chmod: /saswork/sastemp/$sas_work_dir: A file or directory in the path name does not exist.

Last edited by Don Cragun; 11-12-2013 at 12:55 PM.. Reason: Switch ICODE tags to CODE tags and remove extraneous spaces.
# 9  
Old 11-12-2013
Quote:
Originally Posted by zubairom
Smilie Thanks Made in Germany and Carlos for your input... Now I understand what Carlos meant... Yes echoing the $line works ... That was confusing me as why the why loop goes into the awk subshell...you guys cleared that.

For this script I will use variables as suggested by Don as that is a simpler approach.

regarding the additional checks that you proposed </dev/null work fine but I run into some issues using -f option for su and the 'ticks'... With -f option for su it looks like I can't use -R for chmod(my original script did not have -R for chmod but now I added it) and I get

Code:
-R: 0403-010 A specified flag is not valid for this command.

With the 'ticks' looks like it can't resolve the variable(which is what i thought)

Code:
chmod: /saswork/sastemp/$sas_work_dir: A file or directory in the path name does not exist.

The error message you showed above should not be printed as a result of using the command:
Code:
</dev/null su $sas_user -fc "whoami; chmod 777 /saswork/sastemp/'$sas_work_dir'"

The double quotes around the string whoami; chmod 777 /saswork/sastemp/'$sas_work_dir' make the single quotes regular characters with no special meaning, so $sas_work_dir should be expanded before su is invoked. Assuming as an example that $sas_work_dir expands to some/dir), the shell should invoke su with a final operand that is the string whoami; chmod 777 /saswork/sastemp/'some/dir' and the shell that su invokes would then remove those single quotes.

Please show us the exact command line that you are using to invoke su.
# 10  
Old 11-12-2013
Don,

Please see below the complete do while loop

Code:
 
SCRIPT_DIR=/u/sasp/scripts/purge_clean

SASWORK_LIST_SASWORK=$SCRIPT_DIR/saswork_list_saswork

SASWORK=$1

cd $SASWORK
ls -ltr  | egrep -i -v 'total [0-9]+' > $SASWORK_LIST_ALL_BEFORE
egrep -i 'SAS_[0-9a-z]{16}_[0-9a-z]+' $SASWORK_LIST_ALL_BEFORE  > $SASWORK_LIST_SASWORK

 
while read -r x x sas_user x x x x x sas_work_dir
do
    # su the owner of each work directory and change permisions to 777 for the work directory
   echo $sas_user
   echo $sas_work_dir
   </dev/null su $sas_user -c "chmod -R 777 /saswork/sastemp/$sas_work_dir"  # </dev/null prevents an eventual reading from stdin. Just a safety check
done < $SASWORK_LIST_SASWORK

Thanks

Omer
Last edited by Don Cragun; 11-12-2013 at 03:42 PM.. Reason: Please use CODE tags (not ICODE tags) for multi-line sequences.
# 11  
Old 11-12-2013
And by just adding the ticks (single quotes)
Code:
 </dev/null su $sas_user -c "whoami; chmod -R 777 /saswork/sastemp/'$sas_work_dir'"

you get what error or malfunction?
# 12  
Old 11-14-2013
Actually you and Don are right.. single quotes within double quotes are not causing any error.

I must have done somethign wrong the first time when I tested and got the error about not finding the directory..I tested again with single quotes around the '$sas_work_dir' and it worked fine thsi time..

Thanks again for your help
# 13  
Old 11-14-2013
Quote:
Originally Posted by zubairom
Don,

Please see below the complete do while loop

Code:
 
SCRIPT_DIR=/u/sasp/scripts/purge_clean

SASWORK_LIST_SASWORK=$SCRIPT_DIR/saswork_list_saswork

SASWORK=$1

cd $SASWORK
ls -ltr  | egrep -i -v 'total [0-9]+' > $SASWORK_LIST_ALL_BEFORE
egrep -i 'SAS_[0-9a-z]{16}_[0-9a-z]+' $SASWORK_LIST_ALL_BEFORE  > $SASWORK_LIST_SASWORK

 
while read -r x x sas_user x x x x x sas_work_dir
do
    # su the owner of each work directory and change permisions to 777 for the work directory
   echo $sas_user
   echo $sas_work_dir
   </dev/null su $sas_user -c "chmod -R 777 /saswork/sastemp/$sas_work_dir"  # </dev/null prevents an eventual reading from stdin. Just a safety check
done < $SASWORK_LIST_SASWORK

Thanks

Omer
Do you use the contents of the files named by $SASWORK_LIST_ALL_BEFORE and $SASWORK_LIST_SASWORK after this loop completes? If $SASWORK_LIST_ALL_BEFORE isn't used after this loop, the first egrep is superfluous and the code:
Code:
ls -ltr  | egrep -i -v 'total [0-9]+' > $SASWORK_LIST_ALL_BEFORE
egrep -i 'SAS_[0-9a-z]{16}_[0-9a-z]+' $SASWORK_LIST_ALL_BEFORE  > $SASWORK_LIST_SASWORK

can be replaced by:
Code:
ls -ltr | egrep -i 'SAS_[0-9a-z]{16}_[0-9a-z]+' > $SASWORK_LIST_SASWORK

If $SASWORK_LIST_SASWORK isn't used after this loop either, then neither file is needed:
Code:
ls -ltr | egrep -i 'SAS_[0-9a-z]{16}_[0-9a-z]+' |
while read -r x x sas_user x x x x x sas_work_dir
do
    # su the owner of each work directory and change permisions to 777 for the work directory
   echo $sas_user
   echo $sas_work_dir
   </dev/null su $sas_user -c "chmod -R 777 /saswork/sastemp/$sas_work_dir"  # </dev/null prevents an eventual reading from stdin. Just a safety check
done

# 14  
Old 11-15-2013
Thanks for your comments Don Smilie

I actually do use SASWORK_LIST_BEFORE again. The script deletes the orphaned SAS work directories and afterwards it runs sdiff on SASWORK_LIST_BEFORE with SASWORK_LIST_AFTER.

Also another reason why I keep these files temoprarily(deleted at the end of the end of the script) is because I generate a report from these files.
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