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Are you sure it's one to two files per second?
$ ls | wc
1993 1993 34863
$ time find . -name "*.*" -type f | xargs -I '{}' mv {} ../xxx
real 0m2.846s
user 0m0.668s
sys ...

Were /source/dir and /destination/dir on the same file system, mv would just rename the files and not move a single byte.
Hadn't you said new files drop in constantly, I'd have tried to rename the...

Try ..

awk 'NR==FNR {r[$1]=$0;d_start[$1]=$2;d_end[$1]=$3;last_col[$1]=$7;next} ($1 in r) && d_start[$1] <= $3 && d_end[$1] >= $3 { print $0, d_start[$1], d_end[$1], last_col[$1]}' lookup_file...

First of all: what OS, what shell, ...
Second: how about putting the line in a script?

tr is much, much, much better suited for this than sed. No tricks are required to prevent repeat substitution and you feed it the sets directly.

$ echo 123456789 | tr '[12345]' '[58719]'...

Telling sed that the second number 5 is at the end of the string works:


echo 12345 | sed -e 's/1/5/g;s/2/8/g;s/3/7/g;s/4/1/g;s/5$/9/g;'

58719


Hope this helps.

See ahamed's post above. I hope this is not being used for encrypting ;) Having several tries you will easily guess which number translates to which so this does not really look suited for a...

You can use the sed's transform feature for this...

echo 12345 | sed 'y/12345/58719/'
--ahamed