Use Catfish to find files and file content quickly – note content search only works for text type files. Use Recoll for other file types.

Install using Synaptic Package Manager or from Terminal as follows:

sudo apt install catfish

Run it by selecting it from from Utilities or use the Search function and enter Catfish to locate.

Once running you should see screen below.

To search for content first click the settings cog and check “Search File Contents”. This will then force Catfish to search for the string in the files within the top directory you have selected to the left of the search box. In this example we are searching for the content string “tooltip” within files in the the top folder “scss”. The number of hits (3) and files are displayed that contain “tooltip” in the main window. To open a file double-click it.

To search for file names only uncheck “Search File Contents”

If you don’t have a spare Mac or your Mac is too old to download macOS from the Apple App Store then use the method below.

Create account on hackintosh.download

The download required macOS from https://www.hackintosh.download/category/3-macos/

Insert a usb (16GB+ recommended) into Linux PC usb port and run Terminal

Use fdisk to determine your usb dev name letter, e.g. /dev/sdc. It is very important to note the correct device letter or you may overwrite your own system or data drive!

sudo fdisk -l

Use dm2img to copy macOS (OS X El Capitan in this example) to your usb device (sdc in this example). This completely overwrites whatever is on the usb drive already!

sudo apt install dmg2img  # install dmg2img if not installed

sudo dmg2img -v -i ./EL_Capitan.dmg  -o /dev/sdc
Output from dmg2img...
dmg2img v1.6.7 (c) vu1tur (to@vu1tur.eu.org)

./EL_Capitan.dmg --> /dev/sdc

reading property list, 361779 bytes from address 6237611619 ...
partition 0: begin=192, size=430, decoded=284
partition 1: begin=908, size=430, decoded=284
partition 2: begin=1611, size=356137, decoded=239844

decompressing:
opening partition 0 ...         [2] 100.00%  ok
opening partition 1 ...         [2] 100.00%  ok
opening partition 2 ...      [5991] 100.00%  ok

When complete eject the usb to flush IO buffers (important!) by clicking on the usb icon on the desktop and click remove | eject.

Insert usb in your Mac and power-up holding down the Alt | Option key until the Install usb icon is displayed in the middle of the screen.

Select the install usb to install macOS

Once in Recovery mode select Disk Utility to erase disk (if new drive or clean install)

Exit Disk Utility

Select mac OS to install from main menu and install to your main HDD or SSD

Note: the download source above is not Apple approved. To be safe, once your Mac is up and running, download the mac OS again from the Apple Store and re-create the install usb and carry out a clean install.

Display details about firmware, cache, memory

$ sudo lshw -C memory
  *-firmware                
       description: BIOS
       vendor: FUJITSU // Phoenix Technologies Ltd.
       physical id: 0
       version: 6.00 R1.06.3012.A1
       date: 04/21/2011
       size: 110KiB
       capacity: 4032KiB
       capabilities: pci pnp upgrade shadowing escd cdboot bootselect int13floppynec int13floppytoshiba int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer int10video acpi usb ls120boot zipboot biosbootspecification
  *-cache:0
       description: L1 cache
       physical id: 5
       slot: L1 Cache
       size: 64KiB
       capacity: 64KiB
       capabilities: burst synchronous internal write-through data
       configuration: level=1
...
  *-memory
       description: System Memory
       physical id: 2a
       slot: System board or motherboard
       size: 16GiB
     *-bank:0
          description: DIMM DDR3 Synchronous 1067 MHz (0.9 ns)
          product: 99U5471-021.A00LF
          vendor: Toshiba
          physical id: 0
          serial: DE131F7C
          slot: Slot-1
          size: 4GiB
          width: 64 bits
          clock: 1067MHz (0.9ns)
...

Test and Benchmark 3D Graphics

sudo apt install glmark2
glmark2

This method depends on the iso file being designed as bootable, e.g Kaspersky Rescue Disk or Bitdefender Rescue CD, etc.

Plug in the USB flash drive and list its device name using fdisk

sudo fdisk -l
.
.
.
Disk /dev/sdc: 3.8 GiB, 4009754624 bytes, 7831552 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x052e500d

Device     Boot Start     End Sectors  Size Id Type
/dev/sdc1  *     2048 7831551 7829504  3.8G  c W95 FAT32 (LBA)

Unmount the device partition, e.g. sdc1.

umount /dev/sdc1

Copy the iso. file to the device (sdc) not the partition (sdc1). Note the larger block size (4M, default 512bytes) to speed up the transfer. The usb light will flash during copying. Note this can take a long time depending on iso file size. Be patient. When finished dd displays a summary report of bytes copied.

sudo dd if=filename.iso of=/dev/sdc bs=4M

Finally flush the io buffers and eject

sync

sudo eject /dev/sdc