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Top Forums Shell Programming and Scripting Shell Script Post 302928115 by Don Cragun on Tuesday 9th of December 2014 03:31:42 AM
Old 12-09-2014
You haven't said what OS you're using. On some systems test -a file tests for the existence of any file named file; on others it is a binary and operator between two expressions. It would be safer to use test -e file to test for the existence of a file named file or test -f file to test whether or not file exists and is a regular file.

Removing a file won't necessarily free up any space on your file system. If there is a process that is keeping the log file open while writing to it over an extended period of time, the process writing to the log may continue writing to the old file that no longer has a name in the file system. (So, any messages written to the log will be lost forever. And, if you create a new log file with the same name, it may remain empty while messages continue to be written to the old, inaccessible file.) It would be safer to copy /dev/null to the log than to remove it if you want to free up space that had been allocated. But, you really need to be sure that any process that had the log open closes the log file before you remove or truncate it to be sure that future messages written to the log will not be written at a starting offset of 2+Gb.

Your file size calculations are assuming a certain filesystem type (such as with direct blocks, indirect blocks, and double indirect blocks). You might want to key off of the file size (from the stat or ls utilities) rather than the number of blocks allocated (from the du utility). The code junior-helper suggested assumes that all blocks reported by du contain data (i.e., there are no indirect blocks allocated). Whether this does what you want is again filesystem dependent.
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xfs_growfs(8)						      System Manager's Manual						     xfs_growfs(8)

NAME
xfs_growfs, xfs_info - expand an XFS filesystem SYNOPSIS
xfs_growfs [ -dilnrxV ] [ -D size ] [ -e rtextsize ] [ -L size ] [ -m maxpct ] [ -t mtab ] [ -R size ] mount-point xfs_info [ -t mtab ] mount-point DESCRIPTION
xfs_growfs expands an existing XFS filesystem (see xfs(5)). The mount-point argument is the pathname of the directory where the filesystem is mounted. The filesystem must be mounted to be grown (see mount(8)). The existing contents of the filesystem are undisturbed, and the added space becomes available for additional file storage. xfs_info is equivalent to invoking xfs_growfs with the -n option (see discussion below). OPTIONS
-d | -D size Specifies that the data section of the filesystem should be grown. If the -D size option is given, the data section is grown to that size, otherwise the data section is grown to the largest size possible with the -d option. The size is expressed in filesystem blocks. -e Allows the real-time extent size to be specified. In mkfs.xfs(8) this is specified with -r extsize=nnnn. -i The new log is an internal log (inside the data section). [NOTE: This option is not implemented] -l | -L size Specifies that the log section of the filesystem should be grown, shrunk, or moved. If the -L size option is given, the log section is changed to be that size, if possible. The size is expressed in filesystem blocks. The size of an internal log must be smaller than the size of an allocation group (this value is printed at mkfs(8) time). If neither -i nor -x is given with -l, the log contin- ues to be internal or external as it was before. [NOTE: These options are not implemented] -m Specify a new value for the maximum percentage of space in the filesystem that can be allocated as inodes. In mkfs.xfs(8) this is specified with -i maxpct=nn. -n Specifies that no change to the filesystem is to be made. The filesystem geometry is printed, and argument checking is performed, but no growth occurs. -r | -R size Specifies that the real-time section of the filesystem should be grown. If the -R size option is given, the real-time section is grown to that size, otherwise the real-time section is grown to the largest size possible with the -r option. The size is expressed in filesystem blocks. The filesystem does not need to have contained a real-time section before the xfs_growfs operation. -t Specifies an alternate mount table file (default is /proc/mounts if it exists, else /etc/mtab). This is used when working with filesystems mounted without writing to /etc/mtab file - refer to mount(8) for further details. -V Prints the version number and exits. The mount-point argument is not required with -V. xfs_growfs is most often used in conjunction with logical volumes (see md(4) and lvm(8) on Linux). However, it can also be used on a regu- lar disk partition, for example if a partition has been enlarged while retaining the same starting block. PRACTICAL USE
Filesystems normally occupy all of the space on the device where they reside. In order to grow a filesystem, it is necessary to provide added space for it to occupy. Therefore there must be at least one spare new disk partition available. Adding the space is often done through the use of a logical volume manager. SEE ALSO
mkfs.xfs(8), md(4), lvm(8), mount(8). xfs_growfs(8)
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