- Run the command inside backquotes (`...`),
replace that command with its output.
- Example: Print all files modified in past day:
% lpr `find * -type f -mtime -1 -print`
How does that work?
- Shell runs command in backquotes and collects its output:
find * -type f -mtime -1 -print
- Shell runs "outer" command, substituting previous results:
% lpr afile bfile subdir/cfile
- Example: edit all files whose text has the word "CAUTION":
% vi `grep -l CAUTION *`
- Alternate syntax in bash: $(...)
% vi $(grep -l CAUTION *)
- Alternate syntax makes nesting easier:
% vi $(grep -l CAUTION $(find * -mtime -1 -print))