以下是工作中常用的Bash函数, 有的来源自网上, 有的自己写的, 记录于此, 避免重复造轮子.
输出颜色
# Color
RESTORE=$(echo -en '\033[0m')
RED=$(echo -en '\033[00;31m')
GREEN=$(echo -en '\033[00;32m')
YELLOW=$(echo -en '\033[00;33m')
BLUE=$(echo -en '\033[00;34m')
MAGENTA=$(echo -en '\033[00;35m')
PURPLE=$(echo -en '\033[00;35m')
CYAN=$(echo -en '\033[00;36m')
LIGHTGRAY=$(echo -en '\033[00;37m')
LRED=$(echo -en '\033[01;31m')
LGREEN=$(echo -en '\033[01;32m')
LYELLOW=$(echo -en '\033[01;33m')
LBLUE=$(echo -en '\033[01;34m')
LMAGENTA=$(echo -en '\033[01;35m')
LPURPLE=$(echo -en '\033[01;35m')
LCYAN=$(echo -en '\033[01;36m')
WHITE=$(echo -en '\033[01;37m')
RESTORE=$(echo -en '\033[0m')
# usage
echo "${BLUE} It's blue.${RESTORE}"
动态变量名
args="a b c"
for arg in $args
do
# 赋值 Assignment
declare $arg=0
let $arg++
done
for arg in $args
do
# 提取 Extract
echo $arg: ${!arg}
done
日志
# Define log file
logfile=/tmp/log
# Function: Setup logfile and redirect stdout/stderr.
log_setup() {
# Check if logfile exists and is writable.
( [ -e "$logfile" ] || touch "$logfile" ) && [ ! -w "$logfile" ] && echo "ERROR: Cannot write to $logfile. Check permissions or sudo access." && exit 1
tmplog=$(tail -n $logfile_max_lines $logfile 2>/dev/null) && echo "${tmplog}" > $logfile
exec > >(tee -a $logfile)
exec 2>&1
}
# Function: Log an event.
log() {
echo "[$(date +"%Y-%m-%d"+"%T")]: $*"
}
验证json via jq
# validate json via jq
function check_json()
{
JSON_FILE=$1
if [ ! -f $JSON_FILE ]; then
printf "${JSON_FILE} is not exits. Please check. \n"
exit 2
elif ! jq . $JSON_FILE >/dev/null 2>&1; then
printf "jq cannot parse ${JSON_FILE}, Please check. \n"
exit 2
fi
}
# usage
check_json /tmp/test.json