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Bash + basic Linux commands 151

export IFS='
'
for f in $(ls -R1);do export n=$(echo $f|tr ' ' '_');yes n|mv $f $n || yes n|mv $f `echo $n;echo $f|md5sum`
done

POSIX(Tested on zsh) + basic Linux commands 151

export IFS='
'
for f in $(ls -R1);do export n=$(echo $f|tr ' ' '_');yes n|mv $f $n || yes n|mv $f `echo $n;echo $f|md5sum`
done

Bash + basic Linux commands 154

export IFS='
'
for f in $(ls -cR)
do export n=$(echo $f|tr ' ' '_')
yes n | mv $f $n || yes n | $f $(echo $n echo $f|md5sum)
done

Bash + basic Linux commands 151

export IFS='
'
for f in $(ls -R1);do export n=$(echo $f|tr ' ' '_');yes n|mv $f $n || yes n|mv $f `echo $n;echo $f|md5sum`
done

Bash + basic Linux commands 199

export IFS='
'
for file in $(ls -cR)
do export newfile=$(echo $file|tr ' ' '_')
mv --reply=no $file $newfile || mv --reply=no $file $(echo $newfile echo $file|md5sum)
done

Bash + basic Linux commands 154

export IFS='
'
for f in $(ls -cR)
do export n=$(echo $f|tr ' ' '_')
yes n | mv $f $n || yes n | $f $(echo $n echo $f|md5sum)
done