Mac Pro :: One Or More Items Can’t Be Changed Because They Are In Use

Screen Shot 2017-11-15 at 10.39.12 AM.png

Just to update – that command worked perfectly. I had over 200 files however, and didn’t want to run through each one. This command, when run in the directory of the offending files, will find all files and fix them.

for f in *.*; do xattr -d "$f"; done

I know this is an old thread, but I just stumbled across it tonight whilst having the same issue in El Cap. Hope this helps someone!


RHCSA Exam EX200 Cheat Sheet Part 2

Here’s the RHCSA EX200 cheat sheet part 2. Enjoy:

Software Management

To search a package

yum search package-name

To display info of a package

yum info package-name

To install a package

yum install package-name

To remove a package

yum remove package-name

To list a group of available software

yum grouplist

To install a software group

yum groupinstall "group name"

To remove a software group

yum groupremove "group name"

yum repo config is under /etc/yum.repos.d/

To install a rpm package

rpm -i package-name

To check if the package is previously installed

rpm -qa | grep package-name

To remove a rpm package (no need a full name)

rpm -e package-name

To upgrade a package /w status

rpm -Uvh package-name

To list for the documentation of an installed pacakge

rpm -qd | grep package-name (no need a full name)

To list the config file of an installed package

rpm -qc package name (no need a full name)

To display the info of an installed package

rpm -qi package-name

To display kernel number and release version

uname -r

To install a new kernal

yum install kernel

File System

To refresh the system with new partition

partprobe or partx -a /dev/xxx

To create filesystem

mkfs.ext4 /dev/sdb1

To run a filesystem check

fsck /frv/sdb1

To mount a filesystem:
First create a new directory

mkdir /directory
mount -t ext4 /dev/sdb1 /directory

To unmount

umount /directory

To add a swap space on a new partition

mkswap -L NEWSWAP /dev/sdb2
swapon -L NEWSWAP

Then, add an entry on fstab

LABEL=NEWSWAP swap swap defaults 0 0

To setup a user quota
1. Edit fstab,
2. Add usrquota beside defaults
3. mount the partition:

mount -o remount /home

4. Create a userquote file:

quotacheck -cum /home

5. Create username

quota: edquota -u username

6. set a quota:

setquota -u username 30000 35000 0 0 /home

7. Turn on the quota:

quotaon /home

To copy user quota settings

edquota -up username1 username2

To setup a group quota
1. Edit fstab, add grpquota
2. Create a group quota file:

quotacheck -cgm /sales

3. Set a quota:

setquota -g grpname 30000 35000 0 0 /sales

4. Turn on the quota:

quotaon /sales

To view quota usage:

edquota -g sales

To view quota statistic

repquota -ga (for group)
repquota -a (for users)

To create a dump file

dd if=dev/zero of=filename bs=1024 count=25000 (~25MB)

To view an inode

ls -li filename

To create a hard link (cannot cross disk device)

ln filename Desktop/filename-link

To create a symbolic link (can cross disk device)

ln -s /full-path/filename /full-path/filename-link

To setup an ACL
1. Edit fstab,
2. Add acl beside defaults
To view acl:

getfacl /directory

to set acl:

setfacl -m u:username:x /home/directory/

to remove acl:

setfacl -x u:username: /home/directory/


PV(/dev/sda) –> VG –> LV –> directory

Create PV change system ID to LVM (8e) under fdisk

pvcreate /dev/sdb1

To check PV: pvs or pvdisplay

create VG vgcreate vg-name /dev/sdb1 /dev/sdb2

To check VG: vgs or vgdisplay

create LV lvcreate -L 800M -n lv-name vg-name

To check LV: lvs or lvdisplay

create filesystem mkfs.ext4 /dev/vg-name/lv-name

Increase size

resize LV lvresize -L 900M /dev/vg-name/lv-name
resize filesystem resize2fs /dev/vg-name/lv-name

Shrink size
1. unmount the volume first
2. run filecheck fsck -f /dev/vg-name/lv-name

resize filesystem resize2fs /dev/vg-name/lv-name 800M
resize LV lvresize -L 800M /dev/vg-name/lv-name

1. Create a directory for snapshot
2. Create a snapshot of 100M on LV

lvcreate -L 100M -s -n lvmsnapshot /dev/vg-name/lv-name

3. mount the snapshot to retrieve file

mount -t ext4 /dev/vg-name/lvmsnapshot /directoy

delete snapshot:

lvmremove /dev/vg-name/lvmsnapshot

GUI tool for LVM

yum install system-config-lvm