Shell Programming and Scripting

REC=`echo "CAMXI.F0150.txt" | sed 's/.*[FfVv]\([0-9][0-9][0-9][0-9][^.]*\)[.].*/\1/'`
export "FLRECL=$REC"
FLECL=0150

echo "CAMXI.F0150.txt" |grep -o '[A-Z]*\.[A-Z]'
CAMXI.F
echo "CAMXI.F0150.txt" |grep -o '[0-9]\{4\}'
0150
echo "CAMXI.F0150.txt" |grep -o '\.[a-z].*'
.txt

 var=CAMXI.F0150.txt
 
echo ${var##*[0-9]}
.txt
 echo ${var%%[0-9]*}
CAMXI.F

echo ${var%\.*}|tr -d '[A-Z.]'
0150

echo ${var%\.*}|tr -d '.A'
CMXIF0150