A Collection of Random Unix Commands

This collection of apparently random commands and expressions is to remind me how to do things in unix. Hopefully other people might find it useful too.

Apply a command to multiple files:
find <path> -name <file-pattern> -type f -exec <command> '{}' \;

Concatenate multiple files:
cat `find -name <file-pattern>` > <output-file>

Strip end of line characters:
tr -d '\r' < <input-file> > <output-file>

Syntax highlight code in html:
vim -f +"syntax on | let html_use_css = 1 | source \$VIMRUNTIME/syntax/2html.vim | write | qall" <input-file>

Count columns:
awk '{ if (NR==1) {print NF} }' <input-file>

Suspend/resume a process:
kill -SIGSTOP <pid>
kill -SIGCONT <pid>

Compress/decompress a directory:
tar -zcf dir.tar.gz dir tar -zxf dir.tar.gz