Shell Programming and Scripting

#!/bin/bash

 fn a {
beautiful evening
sunny day
}
fn b {
}

fn c {
 hello world .its a beautiful day
 my mom is beautiful.
 my doll is beautiful
 all things bright and beautiful
 all creatures great and small
}

#!/bin/bash

 fn a {
# beautiful evening
sunny day
}
fn b {

}

fn c {
# hello world .its a beautiful day
# my mom is beautiful.
# my doll is beautiful
# all things bright and beautiful
 all creatures great and small
}

cat a.sh | grep -i "beautiful" | awk -F" " '{$1="#" $1;}1' OFS=" "

awk '/beautiful/ {printf "#"} 1' file > tmp$$; mv tmp$$ file

 
awk '/beautiful/  #### Searching for string beautiful here.
{printf "#"}      #### If above condition is TRUE then printing string #
1'                #### awk works on pattern of condition and action/operation so if we give condition here 1 which means we are making condition TRUE so default action will be happening here which is print for awk.
file > tmp$$;     #### mentioning Input_file named file here as putting output into file named tmp with $$ shell's pid.
mv tmp$$ file     #### renaming tmp$$ file to actual Input_file which is file.

#!/bin/ksh
ed -s a.sh <<-EOF
	g/beautiful/s/^/#/
	w
	q
EOF

sed -n 'p; /{/{ :L n; /}/p; s/\(.*\)/#\1/p; bL; };n;p;' file6
#!/bin/bash

 fn a {
# beautiful evening
# added
# sunny day
 }
# }
# fn b {
 }
# }
#
# fn c {
#  hello world .its a beautiful day
#  my mom is beautiful.
#  my doll is beautiful
#  all things bright and beautiful
#  all creatures great and small
 }
# }

/}/p;

{/}/{p; bL;}}