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Shell Programming and Scripting

file to variable.

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# 1  
Old 05-31-2009
file to variable.
I have 12345 stored in the file abc.txt

I want to test if file exist and then move value in shell variable.

Any help ?

Thanks. Smilie
# 2  
Old 05-31-2009
man test:
Code:
       -e FILE
              FILE exists

man bash, section on command substitution, works the same in any POSIX shell:
Code:
   Command Substitution
       Command substitution allows the output of a command to replace the com-
       mand name.  There are two forms:

              $(command)
       or
              `command`

       Bash performs the expansion by executing command and replacing the com-
       mand substitution with the standard output of  the  command,  with  any
       trailing newlines deleted.  Embedded newlines are not deleted, but they
       may be removed during word splitting.  The command  substitution  $(cat
       file) can be replaced by the equivalent but faster $(< file).

# 3  
Old 05-31-2009
Quote:
Originally Posted by ekb
I have 12345 stored in the file abc.txt

I want to test if file exist and then move value in shell variable.
Code:
filename=abc.txt
if [ -f "$filename" ]
then
   read number < "$filename"
else
   echo "File not found" >&2
fi

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