Check free disk space for current partition in bash

Question

I am writing an installer in bash  The user will go to the target directory and runs the install script  so the first action should be to check that there is enough space  I know that df will report all file systems  but I was wondering if there was a way to get the free space just for the partition that the target directory is on   Edit - the answer I came up with  df  PWD   awk    0-9    print   NF-2      Slightly odd because df seems to format its output to fit the terminal  so with a long mount point name the output is shifted down a line

User · Answer

df command   Report file system disk space usage du command   Estimate file space usage   Type df -h or df -k to list free disk space      df -h   OR     df -k   du shows how much space one or more files or directories is using      du -sh   The -s option summarizes the space a directory is using and -h option provides Human-readable output

User · Answer

Yes   df -k     for the current directory   df -k  some dir   if you want to check a specific directory   You might also want to check out the  stat 1  command if your system has it  You can specify output formats to make it easier for your script to parse  Here s a little example     echo      stat -f --format   a  S

User · Answer

Type in the command shell     df -h    or      df -m   or      df -k   It will show the list of free disk spaces for each mount point   You can show view single column also    Type    df -m  awk   print  3     Note  Here 3 is the column number  You can choose which column you need

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A complete example for someone who may want to use this to monitor a mount point on a server  This example will check if  var spool is under 5G and email the person         bin bash     -----------------------------------------------------------------------------------------     SUMMARY  Check if MOUNT is under certain quota  mail us if this is the case     DETAILS  If under 5G we have it alert us via email  blah blah       -----------------------------------------------------------------------------------------     CRON  0 0 4 8 12 16        var www httpd-config server scripts clear root spool log bash    MOUNTP  var spool    mount drive to check   LIMITSIZE 5485760   5G   10 1024 1024k     limit size in GB    FLOOR QUOTA    FREE   df -k --output avail   MOUNTP    tail -n1    df -k not df -h   LOG  tmp log-  basename   0   log   MAILCMD mail   EMAILIDS  dude wheres mycar    MAILMESSAGE  tmp tmp-  basename   0        -----------------------------------------------------------------------------------------    function email on failure               sMess   1            echo     gt  MAILMESSAGE           echo  Hostname    hostname    gt  gt  MAILMESSAGE           echo  Date  amp  Time    date    gt  gt  MAILMESSAGE              Email letter formation here            echo -e   n    date   Y m d  H M S Z    Current Status  n n   gt  gt  MAILMESSAGE           cat  sMess  gt  gt  MAILMESSAGE            echo     gt  gt  MAILMESSAGE           echo      This email generated by   basename  0  shell script       gt  gt  MAILMESSAGE           echo      Please don t reply this email  this is just notification email       gt  gt  MAILMESSAGE              sending email  need to have an email client set up or sendmail             MAILCMD -s  Urgent MAIL Alert For   hostname  AWS Server    EMAILIDS   lt   MAILMESSAGE               -f  MAILMESSAGE     amp  amp  rm -f  MAILMESSAGE           -----------------------------------------------------------------------------------------    if     FREE -lt  LIMITSIZE     then           echo  Writing to  LOG            echo  MAIL ERROR  Less than      FREE 1000    MB free  QUOTA  on  MOUNTP     tee   LOG            echo -e   nPotential Files To Delete     tee -a   LOG            find  MOUNTP -xdev -type f -size  500M -exec du -sh          sort -rh   head -n20   tee -a   LOG            email on failure   LOG    else           echo  Currently       FREE- LIMITSIZE  1000    MB of QUOTA available of on  MOUNTP      fi

User · Answer

To know the usage of the specific directory in GB s or TB s in linux the command is   df -h  dir inner dir     or   df -sh  dir inner dir   and to know the usage of the specific directory in bits in linux the command is   df-k  dir inner dir

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I think this should be a comment or an edit to ThinkingMedia s answer on this very question  Check free disk space for current partition in bash   but I am not allowed to comment  not enough rep  and my edit has been rejected  reason   this should be a comment or an answer    So please  powers of the SO universe  don t damn me for repeating and fixing someone else s  answer   But someone on the internet was wrong     and they wouldn t let me fix it   The code     df --output avail -h   PWD    sed  1d s   0-9   g    has a substantial flaw   Yes  it will output 50G free as 50 -- but it will also output 5 0M free as 50 or 3 4G free as 34 or 15K free as 15   To create a script with the purpose of checking for a certain amount of free disk space you have to know the unit you re checking against  Remove it  as sed does in the example above  the numbers don t make sense anymore   If you actually want it to work  you will have to do something like   FREE  df -k --output avail   PWD    tail -n1      df -k not df -h if     FREE -lt 10485760     then                 10G   10 1024 1024k        less than 10GBs free  fi    Also for an installer to df -k  INSTALL TARGET DIRECTORY might make more sense than df -k   PWD   Finally  please note that the --output flag is not available in every version of df   linux

User · Answer

df --output avail -B 1   PWD   tail -n 1   you get size in bytes this way

[linux] Check free disk space for current partition in bash

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