Friends,

I have a script , working nicely , where i
do a md5sum check on a file and I print to a log

md5sum -c mypath/myFile.mp4 | tee -a myLogPath/mylog.txt

my actual command with my Vars is this
md5sum -c $pathdeliver/$f | tee -a $mypathdeliver/hashCheck_$ClientDrv_$nTexDrv.txt

as you can see I am using a piped into tee to save the output into a file
and as you know one expects this to output to the terminal and print in the txt file something like

myFile.mp4: OK

Here is what i wish to do ...and I am stumped as to how to do it

IF
the check is NOT ok

where the output would be
myFile.mp4: FAILED
md5sum: WARNING: 1 computed checksum did NOT match

I would like to write a diffrent txt file . call it an error log

so if FAILED then I print something like
filename and failed into a error_Hash.txt

so this error_Hash.txt would only be made if there is a fail

something like that

thanks much

i have tried the following
#!/bin/bash

cd /media/C_001

#md5sum -c /media/C_001/UNTA_AR0776-686057-LT630-25.mkv.md5 | tee result.txt
md5sum -c UNTA_AR0776-686057-LT630-25.mkv.md5 | tee result.txt
# md5sum -c /media/C_001/UNTA_AR0776-686057-LT630-26.mkv.md5 # | tee result.txt
# md5sum -c UNTA_AR0776-686057-LT630-26.mkv.md5
# | tee result.txt
if [ $? -eq 0 ]; then
echo all is well
else
echo something went wrong
fi

that is not working



what i am presently doing and I think ...works well enough

is to utilize the file that I am doing a tee into
read the last line
check for FAIL

like so

#!/bin/bash

cd /media/C_001


for f in *.md5; do

echo working on $f

md5sum -c /media/C_001/$f | tee -a /media/C_001/result.txt

lastLn=$( tail -n 1 /media/C_001/result.txt )
echo my last line was $lastLn

if [[ "$lastLn" =~ "FAILED" ]]; then
echo "the hash is bad"
echo $lastln F
echo $lastln FF
echo $f Fail >> /media/C_001/err_log.txt
else
echo "all is well"
fi

done



.......

maybe

looks like you need something like this:
see man bash about it

1 members found this post helpful.

The classic method:
save the md5sum output in a variable,
check exit status,
print the variable.
Once you have a variable you can print it twice instead of duping with tee. And a print can be efficiently directed to an output stream (that is associated with a file once when the loop started)

2 members found this post helpful.

I'm not really sure this is the best approach: you still lost the error message of md5sum.

You mean the stderr (descriptor 2) is not captured?
No problem, simply direct to the error stream
Or
Explanation for the latter: The (subshell) gets the file descriptors cloned in the same way as the variables are cloned.
Of course you can also merge stderr into the output variable

1 members found this post helpful.

Thank you all for the wisdom
I have learned much

Thank you

best wishes