我们可以简单认为OLTP服务与在线业务,直接和C端用户交互;在线数据经过ETL之后存储到OLAP中一份用于商业分析或离线特征计算后再反哺到在线业务(比如TDW / 用户画像特征等) 如下是ETL (Extract - Transform-Load,提取/转换/加载)的过程: 将不同业务系统的数据库经过提取之后转换为分析需要的数据结构,加载到OLAP等数据仓...
_repeat() { #@ USAGE: _repeat string number _REPEAT=$1 while (( ${#_REPEAT} < $2 )) ## Loop until string exceeds desired length do _REPEAT=$_REPEAT$_REPEAT$_REPEAT ## 3 seems to be the optimum number done _REPEAT=${_REPEAT:0:$2} ## Trim to desired length } repeat() { ...
then make that arg count from the right (subtract from the number of tokens, so that FIRST = -1 means the next to last token on the line). If LAST is `$' the last arg from STRING is used. */char*history_arg_extract(first, last,string)intfirst, last;constchar*string; {registerin...
Truncating string variables is a common task in bash scripting as it provides the ability to easily extract a portion of a string based on its position or length is a powerful tool that can be used to manipulate and transform data in a variety of ways. This article covered what a truncated...
function extract(){ local -n myarray=$1 local idx=$2 echo "${myarray[$idx]}"}Fruits=('Apple' 'Banana' 'Orange')extract Fruits 2 # => Orangle Bash 字典 定义 1 declare -A sounds 1234 sounds[dog]="bark"sounds[cow]="moo"sounds[bird]="tweet"sounds[wolf]="howl" 使用字典 12345 ...
# extract number of milliseocnds from string as integer MILLISECONDS=`echo$OUTPUT|awk'{ print $1 }'|awk-F.'{ print $1 }'` echo"Number of ms =$MILLISECONDS" sleep1 done echo"ping time exceeded 1000 milliseconds" The third example will take a file and will combine the file with itself...
# Function to get the length of a string string_length() { local str="$1" echo "Length of '$str' is: ${#str}" } # Function to extract a substring from a string substring_extraction() { local str="$1" local start="$2" ...
Extract $length of characters substring from $string starting from $position. In the below example, first echo statement returns the substring starting from 15th position. Second echo statement returns the 4 characters starting from 15th position. Length must be the number greater than or equal to...
Where String is input string. x is starting position in string(index starts from 1) y is number of characters starting from x (optional) Let’s create a test file. $ cat > test.txt This is sample file Let's take a look at a few examples of using awk's substr function on the pre...
Extract $length of characters substring from $string starting from $position. In the below example, first echo statement returns the substring starting from 15th position. Second echo statement returns the 4 characters starting from 15th position. Length must be the number greater than or equal to...