Visit The New, Modern Unix Linux Community


Search a multi-line shell command output and execute logic based on result


 
Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Search a multi-line shell command output and execute logic based on result
# 1  
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
# 2  
Hi, try something like:
Code:
count=$( cargo build 2>&1 | grep -c 'error\[' )

This User Gave Thanks to Scrutinizer For This Post:
# 3  
Thanks, this works! Smilie

--- Post updated at 09:54 PM ---

A bit of an unrelated question, the snippet mentioned by Scrutinizer works when calling cargo build. If I use a hot-reload tool such as cargo-watch as my initial command, it does not work. I was reading the documents for cargo-watch and it seems to be built on top of watchexec, not sure if that blocks I/O somehow? Does anyone know how I can get the grep command to work with cargo watch? What is stopping it from functioning as intended?

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #832
Difficulty: Medium
JSON is a data serialization format.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Merge multi-lines into one single line using shell script or Linux command

Hi, Can anyone help me for merge the following multi-line log which beginning with a " and line ending with ": into one line. *****Original Log***** 087;2008-12-06;084403;"mc;;SYHLR6AP1D\LNZW;AD-703;1;12475;SYHLR6AP1B;1.1.1.1;0000000062;HGPDI:MSISDN=12345678,APNID=1,EQOSID=365;... (3 Replies)
Discussion started by: rajeshlinux2010
3 Replies

2. Shell Programming and Scripting

Execute command and show result in web page

Hi everyone, I have two question 1- I want to execute command in shell and after execution result show in a web server. (kind of making UI ) e.g. in shell root ~: show list item1 item2 item(n)in web server in a page draw a table and show those items in itno | name... (1 Reply)
Discussion started by: indeed_1
1 Replies

3. Shell Programming and Scripting

How to execute a command on each line of output from another command?

Hello :) new to bash not to programming. I have an on-going need to change the owning group on sets of files and directories from the one they were created with or changed to on update to the one they need to have going forward. find {target_root} -group wrong_group gets me a newline... (4 Replies)
Discussion started by: naftali
4 Replies

4. Shell Programming and Scripting

sed working on command line but file unchanged when execute with Shell script

I have a simple task to replace unix line feed end of line characters with carriage returns. When I run the following “change file in place” sed instruction from the command line all the Line feeds are successfully replaced with Carriage returns. sed -i 's/$/\r/' lf_file.txt But that same... (1 Reply)
Discussion started by: hawkman2k
1 Replies

5. Shell Programming and Scripting

Output block of lines in a file based on grep result

Hi I would appreciate your help with this. I have a output file from a command. It is broken based on initial of the users. Exmaple of iitials MN & SS. Under each section there is information pertaining to the user however each section can have different number of lines. MY challenge is to ... (5 Replies)
Discussion started by: mnassiri
5 Replies

6. Shell Programming and Scripting

Different cmd to execute and based on some pattern parse it and then store result in xlx format

Hi I have a different requirement, I need to run some application on my device from a file app_name.txt one by one which is like this: /usr/apps/email /usr/apps/message /usr/apps/settings after each app while it is running I need to execute again one cmd like ps -ef |grep... (2 Replies)
Discussion started by: Sanjeev Roy
2 Replies

7. Shell Programming and Scripting

Multi-line filtering based on multi-line pattern in a file

I have a file with data records separated by multiple equals signs, as below. ========== RECORD 1 ========== RECORD 2 DATA LINE ========== RECORD 3 ========== RECORD 4 DATA LINE ========== RECORD 5 DATA LINE ========== I need to filter out all data from this file where the... (2 Replies)
Discussion started by: Finja
2 Replies

8. Shell Programming and Scripting

Joining multi-line output to a single line in a group

Hi, My Oracle query is returing below o/p ---------------------------------------------------------- Ins trnas value a lkp1 x a lkp1 y b lkp1 a b lkp2 x b lkp2 y ... (7 Replies)
Discussion started by: gvk25
7 Replies

9. Shell Programming and Scripting

Use grep result to execute next command

Hi I am trying to run 2 servers using a script one after the other. I start the first one: run.sh -c servername >> jboss_log.txt & Then I have to wait until I see Started message in the log file before I launch the other server. I can't use sleep because I am not sure how long it'll... (5 Replies)
Discussion started by: iririr
5 Replies

10. Programming

how to execute multi command???

Hi every one I'm writing C program that do the following: will creat new sample command in unix using C let be the name is do.c, the do must execute more the one command for example do ls ps it will execute ls the ps also I should create a log file the track the command and exit status of... (4 Replies)
Discussion started by: aliG4
4 Replies

Featured Tech Videos