$ tree node_modules/ | count zsh: command not found: count $ tree node_modules/ | lines zsh: command not found: lines $ tree node_modules/ | wc -lines wc: illegal option — i usage: wc [-clmw] [file …] $ tree node_modules/ | wc -countlines wc: illegal option — o usage: wc [-clmw] [file …] $ man wc $ tree node_modules/ | wc -l 292