Shell Programming and Scripting

sed 's/^0*//' yourfile | grep -vE '^[3-9]|^[12][0-9]'

sed 's/^0*//' yourfile | grep -vE '^[2-9]|^1[0-9]'

 
#/bin/ksh
echo "#/bin/ksh" > temp.ksh
echo "sed -e 's/^[$1-9].*//' -e '/^$/ d' file_name > temp" >> temp.ksh
echo "mv temp file_name" >> temp.ksh
chmod +x temp.ksh
./temp.ksh
rm -f temp.ksh

 
#/bin/ksh
sed "/^[$1-9]/d" file_name > temp
mv temp file_name

awk  '{ if (($0 ~ /^[^0-9]/) || ($1 <= 2)) {print $0}}' infile

awk -v max=3  '!($1 ~ "^[0-9][0-9]*$" && $1>max)' yourfile

# del=2;sed "/^[$del-9]/d" datafile

# del=2;sed "/^[1-9][0-9][0-9]*\|^[$del-9]/d" datafile