Bash script that shows each executing statement with file, function and lineno information. It also executes set +x silently.

trace.sh

#!/bin/bash
#
# Show how to make statements verbose with custom information.
#

function fct() {
    echo "$*"
}

##PS4='+ LINE:${BASH_SOURCE[0]}:${BASH_FUNCNAME[0]}:${LINENO}: '
##PS4='$(printf "+ \033[38;5;245m%-16s\033[0m " "${BASH_SOURCE[0]}:${LINENO}:")'
##PS4='$(printf "\033[38;5;247m+ %-20s\033[0m " "${BASH_SOURCE[0]}:${LINENO}:")'
PS4='$(printf "+ %s|%-20s " $(date +"%Y-%m-%dT%H:%M:%S") "${BASH_SOURCE[0]}|${FUNCNAME[0]}|${LINENO}|")'

set -x

# This will be verbose.
echo "#1"
echo "#2"
fct "fct: #1"

# This will be silent (not visible).
{ set +x; } 2>/dev/null

# This will not be verbose.
echo "#3"
echo "#4"
fct "fct: #2"