Don't Repeat Yourself Scripting Library - Commonly needed scripts

Important

This is to be discontinued and the new library replacing this will be https://github.com/stroparo/sidra

Author: Cristian Stroparo

License: May be used for commercial and non-commercial purposes, maintaining original source code comments with project title and original credits intact, and also state the author as such in the list of authors of any new / forked versions derived from this one.

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The DRYSL - DRY Scripting Library (abbrev. 'DS' in source code) is a collection of useful scripts in the form of functions and scripts (or "recipes", as in Chef lingo, although this library does not relate to Chef at all). Several subjects are covered relating but not limited to file manipulation, tech ops, text processing etc.

Key advantages of using it in your project / environment:

• Convention over configuration e.g. all files in "$DS_HOME/functions/" are sourced during 'dsload' (the entry point of this library, sourced in your shell profile).
• chmod automagic: all scripts in recipes*/ or scripts*/ directories are marked executable (chmod +x) during profile sourcing (how many times in your life did you have to chmod before calling a script? not anymore...).
• Plugability i.e. modularized: Easy plugin installation & maintenance mechanism.

Currently the Bash and Zsh shells are supported.

Some features of this project replicate GNU tools features and those were intentional as to have this possibilities in a non-GNU environment. (Perhaps you are on IBM AIX where policies or sysadmins do not allow for the 'GNU toolbox for AIX' to be installed etc.)

Help

The dshelp function is the help system entry point. It will output something like this:

dshelp - display this help messsage
dsinfo - display environment information
dslistfunctions - list DRYSL - DRY Scripting Library's functions
dslistscripts - list DRYSL - DRY Scripting Library's scripts
dsversion - display the version of this DRYSL - DRY Scripting Library instance

Important

Soon the dshelp command will accept the name of a function or script as an argument and will display its corresponding help and/or usage message.

Installation

Automatic

Copy & paste the following command into your shell session in a terminal:

bash -c "$(curl -LSf "https://raw.githubusercontent.com/stroparo/ds/master/setup.sh" \
  || curl -LSf "https://bitbucket.org/stroparo/ds/raw/master/setup.sh")"
type dsload >/dev/null 2>&1 && dsload || . ~/.ds/ds.sh

ERROR curl not found: If you do not have curl, substitute the 'curl [options]' call for wget -O -.

If behind a proxy try disabling SSL by adding curl's -k option to the installation command above.

Manual

You might want to install DS manually when there is a network restriction such as no Internet access for the host etc.

Execute:

1. Create the directory to house the final install which the official DS_HOME variable will point to.
2. Place the files in that DS_HOME directory.
3. Source ds.sh in your shell profile i.e.

• .bashrc
• .zshrc
• .profile
• Etcera

The default DS_HOME is $HOME/.ds (~/.ds) so if you install in there, just source ds.sh:

source ~/.ds/ds.sh

Otherwise, specify the directory (after sourcing it will be pointed to by the $DS_HOME environment variable) both as ds.sh's dirname as well as the last argument:

source {dir}/ds.sh {dir}

Plugins

Nowadays lots of software are modular and allow for plugability via Git repositories etc. In this same spirit, the plugin mechanism for DS aims to be as straightforward as it gets by just cloning a repository and copying it over on top of $DS_HOME, this library's root installation directory.

The script that performs this is dsplugin.sh.

It expects user/repo as the argument. It will pull that user's repo from github.com by the default. To use another domain just prepend it with a slash like in domain/user/repo (exactly as in an HTTPS clone URL).

Examples

# This will pull github.com/stroparo/ds-stroparo
dsplugin stroparo/ds-stroparo

# This will pull bitbucket.org/stroparo/ds-stroparo
dsplugin bitbucket.org/stroparo/ds-stroparo

Usage & Examples

Aggregate a file

getmax fieldsep field files...

getmin fieldsep field files...

getsum fieldsep field files...

Append a string to a file only once

appendunique string file1 file2 ...

End of line: windows to linux

dos2unix file1 file2 ...

Grep context emulation (GNU grep's -A, -B & -C options)

grepc [-a afterlines] [-b beforelines] [-c contextlines]

Use -a, -b and -c to emulate GNU grep's -A, -B and -C options, respectively.

Default behavior is -c 10.

Grepping a process

pgr ExtendedREGEX

INI file section extraction

getsection sectionpattern filename

File ab.txt:

[a]
b=1
c=2

[d]
e=3
f=4

getsection a ab.txt

Will output:

b=1
c=2

Looping commands

loop command [arguments ...]

Path munging

pathmunge [-v varname] [-x] {path} [path2 [path3 ...]]

• -v varname causes the varname variable to be munged instead of the default (PATH)
• -x causes the variable to be exported

Printing fields with awk

printawk [-F fieldsep] fieldno1 [fieldno2 ...]

• -F fieldsep works (as in awk) e.g. printawk -F, 1 2 ...

Example:

printawk 1 3 5

Prints fields 1, 3 and 5

Rename files in a tidy fashion

rentidy {dir}

Renames files and directories recursively at {dir}.

Underscores, camel case instances and other special characters are substituted by a hyphen separator.

User confirmation and input

userconfirm message

userinput message

Input will be stored in the userinput variable

validinput {message} {ere-extended-regex}

Input will be stored in the userinput variable; prompts user for the input repeatedly until it matches the regular expression