color


cecho – a function to print using different colors in bash

The following script can be used to print colored text in bash.
You can use it in any script without copy pasting everything in it by executing the following command source cecho.sh.
Doing so, it will load to your script the functions that are defined in cecho.sh, making them available for you to use (something like including code in C, with some caveats).

cecho.sh (compressed) (163 downloads)
#!/bin/bash

# The following function prints a text using custom color
# -c or --color define the color for the print. See the array colors for the available options.
# -n or --noline directs the system not to print a new line after the content.
# Last argument is the message to be printed.
cecho () {

    declare -A colors;
    colors=(\
        ['black']='\E[0;47m'\
        ['red']='\E[0;31m'\
        ['green']='\E[0;32m'\
        ['yellow']='\E[0;33m'\
        ['blue']='\E[0;34m'\
        ['magenta']='\E[0;35m'\
        ['cyan']='\E[0;36m'\
        ['white']='\E[0;37m'\
    );

    local defaultMSG="No message passed.";
    local defaultColor="black";
    local defaultNewLine=true;

    while [[ $# -gt 1 ]];
    do
    key="$1";

    case $key in
        -c|--color)
            color="$2";
            shift;
        ;;
        -n|--noline)
            newLine=false;
        ;;
        *)
            # unknown option
        ;;
    esac
    shift;
    done

    message=${1:-$defaultMSG};   # Defaults to default message.
    color=${color:-$defaultColor};   # Defaults to default color, if not specified.
    newLine=${newLine:-$defaultNewLine};

    echo -en "${colors[$color]}";
    echo -en "$message";
    if [ "$newLine" = true ] ; then
        echo;
    fi
    tput sgr0; #  Reset text attributes to normal without clearing screen.

    return;
}

warning () {

    cecho -c 'yellow' "[email protected]";
}

error () {

    cecho -c 'red' "[email protected]";
}

information () {

    cecho -c 'blue' "[email protected]";
}

 

Usage

Function cecho accepts the options to set the color and to control if a new line should be print.
Parameter -c or --color define the color for the print. See the array colors for the available options.
Parameter -n or --noline directs the system not to print a new line after the content.
The last parameter is the string message to be printed.
Functions warning, error and information are using cecho to print in color.
These three functions always print a new line and they have hardcoded one color set for each.

Example

#Get the name of the script currently being executed

scriptName=$(basename $(test -L "$0" && readlink "$0" || echo "$0"));

#Get the directory where the script currently being executed resides

scriptDirDIR=$(cd $(dirname "$0") && pwd);

#Print in blue color with no new line

cecho -n -c 'blue' "$scriptDir";

#Print in red color with a new line following the message

cecho -c 'red' "$scriptName";

#Using the information() function to print in blue followed by a new line

information ‘End of script’;

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Bash Function to print out the files and the lines that contain a needle

The following code will create a function in bash that accepts two parameters (1: the place to search in, 2: the value to search for).

You can place it in your ~/.bashrc file to have it available whenever you open a bash shell.

#1. Copy/paste the below lines in your .bashrc

#takes 2 parameters (1: the haystack to search in, 2: the needle)
# Will print out the files and the lines that contain the needle
xfind(){
  FIND_VAR="$2";
  STACK="$1";
  if [ -f "$STACK" ] || [ -d "$STACK" ]; then
    find "$STACK" \
      -exec grep --color "$FIND_VAR" -sl '{}' \; \
      -exec grep "$FIND_VAR" -s '{}' \;
  else
    echo "ERROR: No file or folder with the name '$STACK' exist";
  fi
}
#2. Run source ~/.bashrc -- to reload 

Usage examples:

xfind . "bar";
xfind /etc/ "conf";

Tail logs with color for Monolog 1

#1. Copy/paste the below lines in your .bashrc

tailf-with-colors () {
    if [ -z "$1" ] ; then
        echo "Please specify a file for monitoring"
        return
    fi

    tail -f $1 | awk '
                {matched=0}
                /INFO:/    {matched=1; print "\033[0;37m" $0 "\033[0m"}   # WHITE
                /NOTICE:/  {matched=1; print "\033[0;36m" $0 "\033[0m"}   # CYAN
                /WARNING:/ {matched=1; print "\033[0;34m" $0 "\033[0m"}   # BLUE
                /ERROR:/   {matched=1; print "\033[0;31m" $0 "\033[0m"}   # RED
                /ALERT:/   {matched=1; print "\033[0;35m" $0 "\033[0m"}   # PURPLE
                matched==0            {print "\033[0;33m" $0 "\033[0m"}   # YELLOW
        '
}

#2. Run source ~/.bashrc -- to reload 

#3. Run tailf-with-colors <filename>