How do I write a sed script the rearranges/refactors a string of characters of a file?
The contents of my file are:
for(int i=0; i<old(a, 10); i++)
{
sum += old(c*c, i*a)
}
And I want the modified contents to look like:
for(int i=0; i<new(10,0,a); i++)
{
sum += new(i*a, c*c)
}
The following works with GNU sed - it makes use of the \< and \> word-boundary markers to make sure it only changes old to new when it is a "word" by itself and not just embedded as part of a word like cold.
$ sed -e 's/\<old\>/new/g' foo.c
for(int i=0; i<new(a, 10); i++)
{
sum += new(c*c, i*a)
}
Use GNU sed's -i option if you want it to change the file in-place rather than print to stdout.
WARNING: This sed script will change ALL occurences of /\<old\>/ in the source file. This may be much more than you want to change.
gnu sed:
/bin/sed -ire \
's!\<old\(([^)]+), *([^) ][^)]*)\)!new(\2, \1)!g' \
*.c </dev/null
new(10,0,a)a typo? is it supposed to benew(10, a)?0in between the 10 and a