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Full Discussion: Search a multi-line shell command output and execute logic based on result
Top Forums UNIX for Beginners Questions & Answers Search a multi-line shell command output and execute logic based on result Post 303042192 by yogi on Wednesday 18th of December 2019 02:20:07 PM
Old 12-18-2019
Search a multi-line shell command output and execute logic based on result
The following is a multi-line shell command example:


Code:
$cargo build
   Compiling prawn v0.1.0 (/Users/ag/rust/prawn)
error[E0433]: failed to resolve: could not find `setup_panix` in `human_panic`
  --> src/main.rs:14:22
   |
14 |         human_panic::setup_panix!();
   |                      ^^^^^^^^^^^ could not find `setup_panix` in `human_panic`

error[E0412]: cannot find type `DGConfig` in crate `prawn`
  --> src/main.rs:25:27
   |
25 |     let db_config: prawn::DGConfig = envy::from_env().unwrap_or_else(|err| {
   |                           ^^^^^^^^ help: a struct with a similar name exists: `DBConfig`

error: aborting due to 2 previous errors

What I would like to accomplish here is to use the above multi-lines returned by cargo build command. Search all multi-lines for error[] substrings and store the count in a variable so the result can be used to handle another case logic.


Ideally, I want to accomplish something along the following code block:


Code:
function cargo_watch_notify() {
  echo "Watching for .rs file changes..."

  count=0
  "$(echo cargo build | egrep -w 'error' | ls -c >>>$count)"
  if [ $count -ge 1 ]; then
    growlnotify --title "Error" --message "Compiler found $count errors!"
  else
    growlnotify --title "Success" --message "Cargo build compiled successfully!"
  fi
  exit 1;
}

I realize the above block is broken. This is just what I have to work with for the moment. The only difference in my example is that I need to search for error and brackets strings and not the error string by itself. i.e. error[E0412] the top cargo build command should return a count of 2
 

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LEARN ABOUT LINUX

build-rdeps

BUILD-RDEPS(1)                                                                                                                      BUILD-RDEPS(1)

NAME

       build-rdeps - find packages that depend on a specific package to build (reverse build depends)

SYNOPSIS

       build-rdeps package

DESCRIPTION

       build-rdeps searches for all packages that build-depend on the specified package.

OPTIONS

       -u, --update
           Run apt-get update before searching for build-depends.

       -s, --sudo
           Use sudo when running apt-get update. Has no effect if -u is omitted.

       --distribution
           Select another distribution, which is searched for build-depends.

       --only-main
           Ignore contrib and non-free

       --exclude-component
           Ignore the given component (e.g. main, contrib, non-free).

       --origin
           Restrict the search to only the specified origin (such as "Debian").

       -m, --print-maintainer
           Print the value of the maintainer field for each package.

       -d, --debug
           Run the debug mode

       --help
           Show the usage information.

       --version
           Show the version information.

REQUIREMENTS

       The tool requires apt Sources files to be around for the checked components.  In the default case this means that in /var/lib/apt/lists
       files need to be around for main, contrib and non-free.

       In practice this means one needs to add one deb-src line for each component, e.g.

       deb-src http://<mirror>/debian <dist> main contrib non-free

       and run apt-get update afterwards or use the update option of this tool.

LICENSE

       This code is copyright by Patrick Schoenfeld <schoenfeld@debian.org>, all rights reserved.  This program comes with ABSOLUTELEY NO
       WARRANTY.  You are free to redistribute this code under the terms of the GNU General Public License, version 2 or later.

AUTHOR

       Patrick Schoenfeld <schoenfeld@debian.org>

Debian Utilities                                                    2013-12-23                                                      BUILD-RDEPS(1)
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