Shell script for regular cleanup of log files by "Shell combat"

Function Description: Cleans the Messages history log file (Messages-date) under the/var/log/path, but does not clean the messages file itself

Dependency requirements: The BC module is installed on the server

1 #clean_logs.sh2 #!/bin/bash3 4 # ==========================================5 #function: Cleans the Messages history log file (Messages-date) under the/var/log/path, but does not clean the messages file itself6 #method: Perform daily with crontab as a scheduled task7 #return: None8 #Warning: Prohibit direct deletion of/var/log/messages files9 #Date: 2018-04-23Ten #By:hackhan One #others: None A # ========================================== -  - #create a file to save history log purge records/opt/cleanlogs/clean_log.log the Createlogfile () - { -Targetdir=$1 -Targetfile=$2 +  -         if[ ! -d $targetDir];then +mkdir-P $targetDir A fi at  -         if[ ! -F $targetFile];then - Touch $targetFile - fi - } -  in #writing information to the log file - Logtofile () to { +Msg=$1 -Targetfile=$2 theEcho $msg >>$targetFile * } $ Panax Notoginseng #gets the root disk usage and remaining free space size, returned as an array - getrootdirusagerate () the { +Usagepcent= ' DF/h | Awk'$6== "/" {sub ("%", "" ", $ $);p Rint}'` Aavaildisk= ' DF/h | Awk'$6== "/" {print $4}'` thearray=($usagepcent $availDisk) +Echo ${array[*]} - } $  $ #determine compliance According to the actual disk usage, actual available size, usage threshold, expected available disk space threshold, as entered - #returns 1 for compliance, and 0 for non-conforming requirements - Isdiskusageok () the { -         #actual utilization, minus the number after%WuyiUsagepcent=$1 the         #actual available disk space, unit may be k/m/g -Availdisk=$2 Wu         #usage threshold, minus the number after% -Threshholdpcent=$3 About         #Available disk space thresholds, no units (for G) $Threshholdavaildisk=$4 -  -         if[${availdisk:0-1} ="g"-O ${availdisk:0-1} ="G" ] -  Then AAvaildisknounit= ' echo $availDisk |awk'{sub (/.$/, "")}1'` +  the                 if[' Echo"$usagepcent > $threshHoldPcent"| BC '-EQ 1] | | [' Echo"$availDiskNoUnit < $threshHoldAvailDisk"| BC '-EQ 1 ] -  Then $Echo"0" the                 Else theEcho"1" the fi the  -         Else inEcho"0" the fi the  About } the  the #the generated log directory theTargetdir="/opt/cleanlogs/" + #the generated log file -targetfile="${targetdir}clean_log.log" the #The path where the file is to be deletedBayiTargetlogdir="/opt/shell/logs/" the # targetlogdir= "/var/log/" the  - #Available disk space thresholds, units default to G -availdiskthresh=10 the #disk usage, unit default is% theDiskusagepcent=90 the  the  - createlogfile $targetDir $targetFile the  theresult=(' getrootdirusagerate ') the 94Begincleantime= ' Date'+%y-%m-%d%h:%m:%s'` the  theLogtofile"==========================================="$targetFile theLogtofile"[* * *] scanning time: ${begincleantime}"$targetFile98Logtofile"/Disk info:avail:${result[1]} use%:${result[0]}%"$targetFile AboutLogtofile"-------------------------------------------"$targetFile - 101 102 103Isok= ' Isdiskusageok ${result[0]} ${result[1]} $diskUsagePcent $availDiskThresh '104  the if[$isOK ="0" ]106  Then107 108Logtofile"[+] starting to clean logs ..."$targetFile109  the          forIteminch' LS ${targetlogdir}messages-*';d o111                 #rm-f $item the Echo $item113 logtofile $item $targetFile the  Done the  theLogtofile"[-] Ended cleaning logs!"$targetFile117 fi118 119Endcleantime= ' Date'+%y-%m-%d%h:%m:%s'` - 121Logtofile"[* * *] Ended time: ${endcleantime}"$targetFile122 123Logtofile"==========================================="$targetFile124Logtofile""$targetFile

To implement timed execution, you need to create a crontab plan. For example, we want to execute the log cleaner every 1 hours, assuming that the executable file has a path of/opt/shellutils/clean_logs.sh, then create Crontab as follows:

# CRONTAB-E
* */1 * * */opt/shellutils/clean_logs.sh >>/opt/cleanlogs/clean_log.log 2>&1

Shell script for regular cleanup of log files by "Shell combat"