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Please see my amended post above.

Try this :

$: cat text.txt | while read line
> do
> len=${#line}
> if [ "$len" -ne 53 ]; then
> echo "wrong"
> exit 1
> else
> echo "Perfect"
> fi
> done
wrong
$:
It surely works. In...

for i in *.REMOVE
do
echo mv "$i" "${i%.REMOVE}"
done
Remove the echo when the mv command lines seem alright.

try like this ;) [use the backslash for escape the plus_metacharacter in ext. regex expres]
# sed 's/^ \+//' infile

Something like

$ sed 's/^\(...\)\(.......\)/\1;\2;/g' infile
aaa;aaaaaaa;bbbbbbbbbbbbbbbbbbbb
ccc;bbbbbaa;aaaadddddaaaabbbbbbb
$ sed 's/^\(...\)\(.......\).*/\1;\2;/g' infile
aaa;aaaaaaa;...

awk -F, 'NR==FNR{arr[$1];next} $1 in arr' file1 file2