Use vim's ex mode inside of unix pipe

vimpipe

\vim - -u NONE -es '+1' "+$*" '+%print' '+:qa!' | tail -n +2

# Commented version

# \vim         `# use unaliased version of vim` \
#  -           `# read from stdin` \
#  -u NONE     `# do not process .vimrc` \
#  -es         `# start in :ex mode, do not start visual interface` \
#  '+1'        `# go to the first line` \
#  "+$*"       `# process commands passed as arguments` \
#  '+%print'   `# print each and every line to stdout` \
#  '+:qa!'     `# quit vim` \
#  | tail -n +2 # ignore first two lines


# Examples

# Delete empty lines
# cat file.txt | vimpipe 'g/^$/d' | ...

# Convert all markdown titles to Title Case
# cat book.md | vimpipe 'g/^#/s/\<\(\w\)\(\w*\)\>/\u\1\L\2/g' | sponge book.md

# We've removed 42 pages, so we need to reduce Page number by 42
# cat book.md | vimpipe ':g/Page \d/norm $42^X' | sponge book.md
# cat formula.txt | vimpipe 'g/x=/norm