A commandline Android 'logcat' reader with many additional features. Written in Go, for the purpose of learning Go and improving the Android development experience.

• Colored output
• Write to file
• Highlight messages from package (like com.example)
• Highlight messages with specific tag
• Filter messages from package (like com.example)
• Filter messages from specific tag
• Filter specific priorities
• Filter by minimum priority
• Filter by regexp in log message (grep)
• Wildcard and case insensitive filtering
• Read logs from device (adb), logfile or standard input (stdin)

Example usages below.

There is a OSX binary available in the releases section. To use loca on other platforms, just build the binary from source as described below.

Loca is written in Go. To build loca, you'll need to install go on your system.

Clone loca from github:

git clone https://github.com/erikwt/loca.git

Build loca:

cd /path/to/loca/source # path where you cloned the source
export GOPATH=$(pwd)
go get github.com/pebbe/util
go build loca

Now you can run the 'loca' executable:

./loca

Or put the executable somewhere in your $PATH.

Note that many options can be combined to allow for very complex filtering and highlighting. Loca accepts input directly from a device (over adb), from a file or from the standard input (pipe).

# Same as 'adb logcat' but prettier
loca

# loca help (brief) with all the options and defaults
loca -help

# highlights all log messages from the app with package 'eu.erikw.myapp' 
loca -hl eu.erikw.myapp

# only log messages from the app with package 'eu.erikw.myapp'
loca -p eu.erikw.myapp

# only messages with priority 'Error' or 'Fatal'
loca -prio EF

# only messages with priority 'Warning' or higher
loca -minprio W

# only messages with tag 'MyAppTag'
loca -t MyAppTag

# write log to file
loca -file /tmp/logfile

# read from logfile instead of device
loca -input /tmp/logfile

# read from stdin (adb logcat output without messages containing 'dalvikvm' 
adb logcat | grep -v dalvikvm | loca

# only messages matching regexp 'https://.+.com'
loca -grep https://.+.com

# combination of filters and use of wildcards ;-)
loca -t *man* -hl eu.erikw.myapp -minprio I

Please report issues in the issue tracker.

Loca is licenced under the GNU GPL version 3.

Thanks to pebbe for the IsTerminal(..) implementation in the go util source.