Here’s another little Bash function. It makes it possible to create a new script in one command, creating the file with shebang, making it executable, and opening it in your editor.
Just run newscript scriptname.rb to create a new ruby script with a /usr/bin/env ruby shebang. It also recognizes Python, Perl, and bash extensions, add more as needed.
You can also create a directory with “skeleton” scripts. If you have a list of includes that you always use in your shell scripts, add a ext.txt file to that directory (e.g. rb.txt or py.txt). By default that directory is ~/.newscript_defaults, but you can modify it in the config section. As an example, you might have a sh.txt file that sources a file of common functions you use in bash scripts, or an rb.txt file that includes contains # encoding: utf-8 to be appended after the shebang.
Just add this to ~/.bash_profile, or wherever you source your shell functions from. You’ll need to edit your script location in the scriptdir variable at the top.
# Touch, make executable and start editing a new script
# $ newscript my_new_script.sh
# edit default shebangs within the function
# include additional skeleton files as [extension].txt
# in the $defaults_txt folder defined in config
newscript() {
# Config
# where your scripts are stored
local scriptdir=~/scripts/
# if no extension is provided, default to
local default_ext=rb
# optional, where skeleton scripts (e.g. rb.txt) are stored
local defaults_txt=~/.newscript_defaults/
# End config
local filename="${scriptdir%/}/$1"
if [[ $# == 0 ]]; then # no argument, display help and exit
echo -e "newscript: touch, make executable and \
start editing a new script.\n\033[31;1mError:\033[37;1m Missing filename\033[0m\n\n\
Usage: mynewscript SCRIPT_NAME.ext\n"
return 1
fi
# get the extension from the filename
ext=${filename#*.}
# if there's no extenstion, add default
if [[ $ext == $filename ]]; then
ext=$default_ext
filename=$filename.$ext
fi
# if no script with this name already exists
if [ ! -f $filename ]; then
# create a file for the given extension with appropriate shebang
case $ext in
rb ) echo -e "#!/usr/bin/env ruby" >> $filename;;
py ) echo -e "#!/usr/bin/env python" >> $filename;;
pl ) echo -e "#!/usr/bin/env perl" >> $filename;;
sh | bash ) echo -e "#!/bin/bash" >> $filename;;
zsh | bash ) echo -e "#!/bin/zbash" >> $filename;;
* ) touch $filename;; # any other extension create blank file
esac
# if skeleton files directory and a txt for the given extension exist
if [[ -d ${defaults_txt%/} && -f ${defaults_txt%/}/$ext.txt ]]; then
# concatenate it to the file
cat ${defaults_txt%/}/$ext.txt >> $filename
fi
# Add trailing newline to the new script
echo -ne "\n" >> $filename
# Make it executable
chmod a+x "$filename"
echo -e "\033[32;1m$filename\033[0m"
else # Specified filename already exists
echo -e "\033[31;1mFile exists: $filename\033[0m"
fi
# Edit the script
$EDITOR "$filename"
}
Neat.
Ryan Irelan has produced a series of shell trick videos based on BrettTerpstra.com posts. Readers can get 10% off using the coupon code TERPSTRA.
