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# 1  
Old 04-01-2015
Shell script question
I am getting error files missing. can anyone tell me I can able to read the file. Can you tell what the other part does?
Code:
xargs -i test -f {}

Code:
cat $S.file | uniq | xargs -i test -f {} || error_func "files(s) missing!"

Last edited by rbatte1; 04-07-2015 at 01:28 PM..
# 2  
Old 04-01-2015
Code:
cat $S.file | uniq | xargs -i test -f {} || error_func "files(s) missing!"
 list the lines in the file ${S}.file
                  get a list of unique records
                             test if the records are files
                                                            if they are not call the error_func with the "files(s) missing!" string

# 3  
Old 04-01-2015
I think you cannot use test -f with xargs i.e. with several arguments.
You need a loop that each time calls test -f with one file:
Code:
< $S.file uniq |
while read file
do
  if test \! -f "$file"
  then
    error_func "file(s) missing!"
    break
  fi
done

# 4  
Old 04-01-2015
I think xargs' -i option implies -L1, so test will be called for every single file alone.
This User Gave Thanks to RudiC For This Post:
MadeInGermany
# 5  
Old 04-01-2015
Good point. And even the resulting status seems to work.
Still I recommend a loop here.
For example with a little modification one can print the missing file name:
Code:
< $S.file uniq |
while read file
do
  if test \! -f "$file"
  then
    error_func "missing file: $file"
  fi
done

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