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Check if file exists if not send an alert


 
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# 1  
Check if file exists if not send an alert

Hi,

Im looking to write a script to check if a file exists and if it doesnt then send an email out, Ive found the below code but I don't understand the ! in the if statement can anyone explain?
Any help will be much appreciated

Code:
#!/bin/bash
if [ ! -s filename ]
then
        echo "File not exists" | mailx -s "File Not found" abc@xyz.com
else
        echo "File exists"
        fi

# 2  
man test:
Quote:
! EXPRESSION
EXPRESSION is false
-s FILE
FILE exists and has a size greater than zero
# 3  
'man test' yields:
Code:
       -s FILE
              FILE exists and has a size greater than zero

the leading '!' is a negation of a trailing condition.
# 4  
if i do the below then how do I get it to email me if the file doesnt exist?

Code:
#!/bin/bash
#Script to check if a file exists and if not send an email alert out
#
test -s /export/home/tjmoore/file6

# 5  
Code:
 
[[ -s file ]]  ||  echo "File Doesn't Exist" | mailx -s "FileNotFound" abc@xyz.com

# 6  
Quote:
Originally Posted by 02JayJay02
if i do the below then how do I get it to email me if the file doesnt exist?

Code:
#!/bin/bash
#Script to check if a file exists and if not send an email alert out
#
test -s /export/home/tjmoore/file6

just like your script in the first post of this thread...
# 7  
test and "[" are synonyms, i.e. the same command with two names. So, in principle your script in post #1 should do what you would expect...

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