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Full Discussion: check if directory and file exists
Top Forums Shell Programming and Scripting check if directory and file exists Post 302439121 by ddreggors on Thursday 22nd of July 2010 12:04:57 AM
Old 07-22-2010
Quote:
Originally Posted by citaylor
Code:
if [ -d "$PATHLOGS/$DATE1" -a -d "$PATHLOGS/$DATE2" ]; then
  for files in `ls -A PATHLOGS/$DATE1`
  do
    if [ -s "$files" ]; then
      cp $files $TMP/logs_tmp
    fi
  done
fi

citaylor uses gives a good example, however to not incur the overhead of a seperate subshell (backticks open a new shell) in your for loop...
I would actually allow the shell to do some of that work.


Code:
#!/bin/bash

# With shell 'globbing' the '$PATHLOGS/$DATE1/* ' in the for loop below
# will be expanded to "ls $PATHLOGS/$DATE1/* " without the
# overhead of a new shell or even the "ls" command!

if [ -d "$PATHLOGS/$DATE1" -a -d "$PATHLOGS/$DATE2" ]; then
  for f in $PATHLOGS/$DATE1/*  #<------ Shell 'globbing' & expansion
  do
    if [ -s "$f" ]; then
      /bin/cp $f $TMP/logs_tmp
    fi
  done
fi

Another example that would be even more simple would be:

Code:
#!/bin/bash
if [ -d "$PATHLOGS/$DATE1" -a -d "$PATHLOGS/$DATE2" ]; then
    find $PATHLOGS/$DATE1 -type f ! -size 0 -exec cp -v {} $TMP/logs_tmp \;
fi

To explain:

The find command will look under '$PATHLOGS/$DATE1' for all files that exist and are not folders (-type f) that are not 0 bytes (! -size 0).
Next it will execute a copy command on all files found matching our requirements and copy them to $TMP/logs_tmp ('-exec cp -v {} $TMP/logs_tmp \;').

The '{}' is a place holder for each file as it finds them, and the '\;' at the end is to tell find that this is the end of the exec command.
The nature of the find command is to act on each file as it finds them, much like a for loop would. This way it can exec the command on each file one by one.

Note that the semicolon must be escaped (hence the '\;').
Also note the space between the '!' (not modifier) and the '-size' flag.
 

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LEARN ABOUT SUNOS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The  following  default	shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh,
       /bin/tcsh,  /bin/zsh,  /sbin/jsh,  /sbin/sh,  /usr/bin/bash,  /usr/bin/csh,  /usr/bin/jsh,  /usr/bin/ksh,  /usr/bin/pfcsh,  /usr/bin/pfksh,
       /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.

       Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)).

FILES

       /etc/shells	       lists shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.10							    4 Jun 2001								 shells(4)
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