Shell Programming and Scripting

 
#!/usr/bin/env ksh
#set the internal field seperator for KSH to space
IFS=" "
#read in the first argument assuming it's a file
file=$1
#loop at each line of the file
while read line ; do
# build array of space seperated arguments
  set -A lineargs $line
  for arg in ${lineargs[*]}; do
    arg=`echo $arg | sed 's/'\''/'\'\\\'\'/g'`
    arg=\'${arg}\'
    echo $arg
  done
  echo "new cmd"
done <"$file"

#   replace    '     with       '\''          globally/everywhere
     's/'     \'     '/'        \'\\\'\'         '\g'

"s/'/\\'/g"

$ ls
d1      d2      f1      f2
$ line='cmd * d? f[12]'
$ set -A lineargs $line
$ echo "${lineargs[@]}"
cmd d1 d2 f1 f2 d1 d2 f1 f2
$ echo $line
cmd d1 d2 f1 f2 d1 d2 f1 f2
$ set -o noglob
$ echo $line
cmd * d? f[12]

me@server dir $ls
file1  file2  file3  file4
me@server dir $echo '*'
*
me@server dir $echo *
file1 file2 file3 file4
me@server dir $temp='*'
me@server dir $echo $temp
file1 file2 file3 file4
a7me@server dir $echo "$temp"
*
me@server dir $

cmd1 opt1 opt2 opt3 opt'4 opt5
cmd2 opt1 opt2 opt3 'opt4 opt5
cmd3 opt1 opt2 opt3 opt4' opt5
cmd4 opt'1 'opt2 opt3' opt4' opt5

'cmd4'
'opt'\1'
''\opt2'
'opt3'\'
'opt4'\'
'opt5'
new cmd

VAR=*
$ echo $VAR
file1 file2 file3 ...
$ echo "$VAR"
*
$

$ echo '\'
\
$ echo '\\'
\\
$

$ cat superquote.awk
BEGIN { OFS="' '"; }
{
        # Do a global substitution for all things we haven't explicitly allowed.
        # & becomes the match, so \& becomes \[match], except we need to
        # escape the escaping so it becomes a real backslash.
        # Yes, four backslashes are needed to make one backslash.  kill me
        gsub(/[^a-zA-Z0-9 \t]/, "\\\\&");
        $1=$1   # do a substitution so awk auto-substitutes ' ' between all parameters

        # Print all arguments for debugging, to stderr for easy filtering
        for(N=1; N<=NF; N++) print "'" $N "'" >"/dev/stderr"

        print "'" $0 "'"

}

$ awk -f superquote.awk data
'cmd1'
'opt1'
'opt2'
'opt3'
'opt\'4'
'opt5'
'cmd1' 'opt1' 'opt2' 'opt3' 'opt\'4' 'opt5'
'cmd2'
'opt1'
'opt2'
'opt3'
'\'opt4'
'opt5'
'cmd2' 'opt1' 'opt2' 'opt3' '\'opt4' 'opt5'
'cmd3'
'opt1'
'opt2'
'opt3'
'opt4\''
'opt5'
'cmd3' 'opt1' 'opt2' 'opt3' 'opt4\'' 'opt5'
'cmd4'
'opt\'1'
'\'opt2'
'opt3\''
'opt4\''
'opt5'
'cmd4' 'opt\'1' '\'opt2' 'opt3\'' 'opt4\'' 'opt5'

# ...but the separate ones are printed direct to terminal, not to stdout.
# They won't flow into a pipe, and can be ignored as you please by simple
# redirection.
$ awk -f superquote.awk data 2>/dev/null
'cmd1' 'opt1' 'opt2' 'opt3' 'opt\'4' 'opt5'
'cmd2' 'opt1' 'opt2' 'opt3' '\'opt4' 'opt5'
'cmd3' 'opt1' 'opt2' 'opt3' 'opt4\'' 'opt5'
'cmd4' 'opt\'1' '\'opt2' 'opt3\'' 'opt4\'' 'opt5'

$