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Since I don't know bash...

#!/usr/bin/ksh
parameter1=""

if [ "$1" == "-l" ]
then
parameter1="-l"
else
parameter1="-ltr"
fi

command="ls $parameter1"

echo $command
#-----
#...

$ a="find /your/home/path -type f -print | xargs grep \"pattern\""
$ echo $a
find /your/home/path -type f -print | xargs grep "pattern"
$ eval $a
/your/home/path/filename:pattern

grep -l "abcd" *.cpp |xargs sed -i.bak 's/abcd/xyz/g'

In command mode:

:%s/\([^,]*,[^,]*,[^,]*,\)//

With vim (or other vi clone that supports re-interval:

:%s/\([^,]*,\)\{3}//

Otherwise:

cut -d, -f4- infile