HOWTO force monitor resolution on mxlinux

After recent upgrade, MX Linux could no longer detect my Viewsonic 22 inch monitor.

Due to unknown, the system therefore set the display to a very primitive resolution - VGA 1024x768 (4:3).

According to the monitor spec (from google), natively it should support 1680x1050 (16:10).

run command:

$ cvt 1680 1050

# 1680x1050 59.95 Hz (CVT 1.76MA) hsync: 65.29 kHz; pclk: 146.25 MHz

Modeline "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync

Add the native mode to display port 0, which is how I connect my monitor:

xrandr --newmode "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync

xrandr

xrandr --addmode DisplayPort-0 1680x1050_60.00

If want to config it every time log in, append the following to .profile

xrandr --newmode "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync

xrandr --addmode DisplayPort-0 1680x1050_60.00

#xrandr --output DisplayPort-0 --off --output DVI-0 --mode 2048x1536_60.00 --pos 0x0 --rotate normal --output HDMI-0 --off

xrandr --output DisplayPort-0 --mode 1680x1050_60.00 --pos 0x0 --rotate normal

How to ssh pipe copy files from remote to local compressed

ssh  john@192.168.1.49  "cd ~/Documents && tar -cf - assignments/ | gzip -9"  >  assignments.tar.gz

# syntax explanation

ssh    username@remoteIP     "command string"

macOS howto format usb drive to dos compatible, max 4GB

 diskutil eraseDisk FAT32 MY_DISK1 /dev/disk2

sed command on OSX not supporting '+' or '?' by default

Regex pattern has 3 ways to indicate the occurrence of a character:

"c*"        matching letter 'c'    0 to N    times

"c+"       matching letter 'c'     1 to N    times

"c?"        matching letter 'c'    0 or 1     time

For example, if you want to replace "p...c" in input string,   INSTR="aaabbbcccpppccc"

On Linux, you do        echo $INSTR | sed 's/p\+c/_/'

The same thing on OSX not working, just failed silently.

$ echo $INSTR | sed 's/p\+c/_/'

aaabbbcccpppccc

$ echo $INSTR | sed 's/p+c/_/'

aaabbbcccpppccc

This is because, by default on OSX, sed interprets basic regex.  Instead, we specify using extended regex (-E)

$ echo $INSTR | sed -E 's/p+c/_/'

aaabbbccc_cc

We don't want '*' or the early ccc will be matched.

$ echo $INSTR | sed -E 's/p*c/_/'

aaabbb_ccpppccc

This in fact gives the same result as 's/z*c/_' because 'z' can be zero time

Now, similarly, to indicate 0 or 1 time, use -E as well

$ echo $INSTR | sed -E 's/p?c/_/'

aaabbb_ccpppccc

$ echo $INSTR | sed -E 's/b?c/_/'

aaabb_ccpppccc