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Category: SysAdmin

Posts about system administration.

Posted on March 18, 2022March 18, 2022 Linux Shell Scripting Software Development SysAdmin

Increasing / decreasing number of xargs parallel processes (at run time!)

xargs makes it very easy to quickly run a set of similar processes in parallel – but did you know when you’re half-way through a...

Posted on November 25, 2020November 25, 2020 Linux Shell Scripting Software Development SysAdmin

stdbuf – Run COMMAND, with modified buffering operations for its standard streams

While piping together commands that only output intermittently we run into the pipe buffers created by the pipe() system call (also see overview of pipes...

Posted on October 13, 2020 Linux MacOS MS Windows SysAdmin

Disk Usage

To review disk usage recursively – a few different options exist (when scanning manually through with df and du are not enough). I have found...

Posted on October 13, 2020 Linux SysAdmin

md (software RAID) and lvm (logical volume management)

md Building a RAID array using mdadm – two primary steps: “mdadm –create” to build the array using available resources “mdadm –detail –scan” to build...

Posted on October 13, 2020October 13, 2020 Linux SysAdmin

Supporting old Debian distros

For old servers that need to stay that way (for whatever reason) updates are no longer available but you can access the packages that were...

Posted on September 4, 2020September 4, 2020 AWS SysAdmin

A tale of two burst balances (AWS EC2 and EBS performance)

When using and monitoring AWS for EC2 instances and their attached EBS volumes there are a couple of very important metrics to keep an eye...

Posted on September 3, 2020 Linux SysAdmin

Adding tasks to a background screen

A bunch of processes have failed – and you’d like to restart them in a screen session in case you need to rerun them in...

Posted on February 10, 2020February 10, 2020 Shell Scripting Software Development SysAdmin

single quote characters in a single-quoted string in shells

A very quick and simple comment on building single-quoted strings in shell scripts which include single quotes. Note that it’s not possible to include a...

Posted on December 3, 2019December 3, 2019 Linux SysAdmin

LINES and COLUMNS environment magic

Ever wondered why you can read the $LINES and $COLUMNS environment variables from your text shell and have them seemingly aware (or indeed, actually aware)...

Posted on April 12, 2019 SysAdmin

XTerm*VT100*selectToClipboard: true

The Problem Working with copying text between applications which use the X11 PRIMARY (eg. the quick-copy of selected text and pasting by clicking the middle...

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Recent Posts

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  • Increasing / decreasing number of xargs parallel processes (at run time!)
  • Vim sub-replace-special – ampersands in substitute search/replace
  • stdbuf – Run COMMAND, with modified buffering operations for its standard streams
  • Disk Usage

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