Reuse Commands with Shell Arguments
My arguments for arguments, functions and alias
Posted on March 25, 2023
| 2 minutes
| Vincent Tam
|
0 comment
Background We often want to test the output with different values for a parameter. Here’s an example: we have a parameter that pandoc uses to / compile source code files to PDF / M$ Word / etc.
rm output.html; param=0; pandoc input$param.txt -o output.html; \ echo param = $param In practice, a parameter can be a font, the font size, etc, and there can be multiple parameters.
Problem To change the value in the parameter (e.
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CPU Temperature Display in Conky
Posted on July 31, 2019
(Last modified on August 9, 2019)
| 4 minutes
| Vincent Tam
|
1 comment
Background I’m using Conky for monitoring the system. After a system upgrade, the CPU temperatures were gone. Conky’s standard error showed the following.
Conky: can't open '/sys/class/hwmon/hwmon0/temp3_input': No such file or directory please check your device or remove this var from Conky... Source of message: https://bbs.archlinux.org/viewtopic.php?id=82231
An easy fix would be to adjust the following lines in .conkyrc according to the number N in /sys/class/hwmon/hwmonN containing the file temp3_input. (You may adjust the number 3 according to the number of CPU of your device.
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Right PATH to Linux
Roles of various config files
Posted on May 18, 2019
| 3 minutes
| Vincent Tam
|
1 comment
Background Updated $\LaTeX$ version From this $\TeX$-SE question about tlmgr, we see some advantages of installing $\TeX$Live directly from the official site:
avoid errors due to outdated version of $\TeX$Live supplied by the OS’s package manager easier to manage packages with tlmgr. enjoy the newer version of $\TeX$Live not yet available in your current GNU/Linux version. The installation took about 30 minutes and 5G in the disk. I’ve chosen a local installation as this didn’t require sudo privileges.
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Xubuntu Screen Enlargement
Posted on April 21, 2019
| 1 minutes
| Vincent Tam
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0 comment
Tonight, the screen of Xubuntu suddenly enlarged and blurred. Typing “xubuntu
screen display enlarged” on Google, I’ve learnt that the <Alt> key and the
mouse scroll wheel can enlarge/minify screen display from Ubuntu Forums.
Detect Missing EOF
Posted on December 23, 2018
(Last modified on December 24, 2018)
| 1 minutes
| Vincent Tam
|
0 comment
While editing files on GitHub/Gitlab, missing an empty line at the bottom of a file in the buffer will result in no newline at the end of file. In the case of regular text files, this isn’t consistent with the POSIX standards.
for file in `git ls-files`; do grep -Iq . $file && if ! newline_at_eof $file; then; else echo $file; fi done Fred has provided a shell script for detecting EOF on Stack Overflow.
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Find Files for Rename
Posted on December 23, 2018
(Last modified on April 25, 2019)
| 1 minutes
| Vincent Tam
|
0 comment
Background Three years ago, I wrote Used More Bash Utilities for batch renaming files. One of my Facebook friends has pointed out that it fails for file names containing whitespace.
Problem Recently, I would like to remove the extension name .sh of all shell scripts in ~/bin, so that which {script} will work without .sh.
Method A for loop over $(ls) is a basic solution, but find is more correct since it’s possible that a file name contains a space character.
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Enlarged /var Partition
Used GParted to grow /var partition
Posted on October 6, 2018
(Last modified on May 14, 2019)
| 5 minutes
| Vincent Tam
|
0 comment
Background I’ve installed Ubuntu 18.04 on my new laptop.
Problem The /var partition was too small. The system complained that only 200 MB was left.
Solution Rebooted with my live USB. Opened GParted. Moved /tmp partition to the left and grew it to 6 GB. Grew /var partition to 16 GB Click Results Details [TL;DR] Here’s the GParted generated log.
GParted Details GParted 0.30.0 --enable-libparted-dmraid --enable-online-resize
Libparted 3.2
Move /dev/sdb4 to the left and grow it from 3.
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Install Julia From Source
Custom built Julia from GitHub
Posted on September 22, 2018
(Last modified on March 24, 2023)
| 2 minutes
| Vincent Tam
|
0 comment
Goal To get Julia installed as a normal user on RHEL 6.
Motivation “Julia talks like Python but walks like C.”
To do statistics more efficiently.
The compiled binaries often contain install scripts which put files to shared folders under /usr. Consequently, they have to be run as sudo privileges. That drove me to start this lengthy Julia compilation.
Installation Without sudo privileges, I’ve chosen to compile Julia from source. I was too lazy to get the dependencies fixed.
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My First RHEL Experience
Package installation as a normal user
Posted on September 20, 2018
(Last modified on September 21, 2018)
| 5 minutes
| Vincent Tam
|
0 comment
Introduction This article records my errors and difficulties encountered on the first day I came across Red Hat Enterprise Linux 7 in my school’s laboratory, as a normal user without sudo privileges.
The login screen was gdm, and the desktop environment was GNOME. IBus was used as the input engine.
Packages installed The principal goal is to install tools that I usually use on RHEL without sudo permissions. To do so, I’ve downloaded the executable binaries or source code of these packages.
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Copy File and Preserve Path
Two bash solutions
Posted on September 17, 2018
(Last modified on May 13, 2019)
| 2 minutes
| Vincent Tam
|
0 comment
Background While making changes to a theme for a static site generator, I changed files under a Git submodule included in the repo for my blog. (e.g. themes/beautifulhugo) That’s ideal for local testing, but not for version control. As a result, I cloned the repo for the theme to a directory separate from the one for my bloge (say, ~/beautifulhugo), and commit the changes there, then performed a Git submodule update so as to make the workflow clean.
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