Shell commands used in a development

1. Time Calculation

Starttime= 'Date+'%y-%m-%d%h:%m:%s''; Endtime=`Date+'%y-%m-%d%h:%m:%s''; Start_seconds=$(Date--Date="$starttime"+%s); End_seconds=$(Date--Date="$endtime"+%s);EchoEnd_seconds-start_seconds

2. Get the status code returned by the link

Checkurl='http://www.baidu.com'1 -S-w"%{http _code}" -o temp  ${checkurl}

3.while...do,for cycle; condition to determine if; Exit program exit

 while(' Curl--connect-timeout1-S-W "%{http_code}"-O temp ${checkurl} '! =' $' )) Do             forIinch$(seq 1  -); Do Echo 'sleep countdown to wait URL is ok:'$(( --$i));Sleep 1; Done;//Countdown Endtime=`Date+'%y-%m-%d%h:%m:%s'`; Start_seconds=$(Date--Date="$starttime"+%s); End_seconds=$(Date--Date="$endtime"+%s); if[[$ (end_seconds-start_seconds)] > -]]; ThenExit1            fi    
 Done

4. String interception and substitution

checkurl=${line#*=}    // intercept variable line, reserved checkurl=${checkurl/\$\{esmhost\}/sss to the right of equal sign }   //  Replace ${esmhost} in Checkurl with SSS

5. String substitution for text files

All ABC in the file is replaced by AAAAA

sed ' s#abc#aaaaa#g ' ./docker-compose.yml

6. Fuzzy Matching

If the variable contains the string ' Register.node.checkurl '

if ' Register.node.checkurl [ ]];  Then fi

Shell commands used in a development