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1500 questions
144
votes
4 answers

Command to unlock "Locked" files on OS X

I copied a lot of read-only files from a Windows system to my Mac. When viewing the Info for each file using "Get Info", I can see they are Locked. I'm writing a bash script to copy over some files and I'm getting an error that says "Operation not…
Michael Prescott
  • 4,071
144
votes
2 answers

What is the difference between yum, apt-get, rpm, ./configure && make install?

I am new to Linux and am running CentOS. I have come across four ways to update or install software. So far, I've seen: yum install [program] apt-get install [program] rpm -i [program].rpm wget [program].tar.gz -> unpack -> ./configure -> make ->…
Saif Bechan
  • 3,315
144
votes
4 answers

How do I back up my VS Code settings and list of installed extensions?

I've just been through the VS Code installation process twice. The initial install is quick and painless (as is the editor itself), but I have had to remember the list of extensions I installed and am installing new ones a great rate. With Sublime…
Astravagrant
  • 2,295
143
votes
2 answers

How to manage GPG keys across multiple systems?

I'm new to using GnuPG and trying to understand how best to use it. I've reviewed Short, easy to understand explanation of GPG/PGP for nontechnical people?, but most guides explain PGP with a single-machine perspective. I want to use GnuPG on three…
Justin C
  • 2,541
143
votes
10 answers

How do I join two worksheets in Excel as I would in SQL?

I have two worksheets in two different Excel files. They both contain a list of names, id numbers, and associated data. One is a master list that includes general demographic fields, and the other is a list that only includes name and id, and an…
Joel Coehoorn
  • 28,180
143
votes
9 answers

Is it safe to delete from C:\Windows\Installer?

I've been looking on an XP machine what is using all that diskspace, and it turns out C:\Windows\Installer is high up there on the list of directories that use the most diskspace. It seems to contain a cache of msi and msp files. Is it safe to…
Stijn Sanders
  • 2,446
143
votes
5 answers

What is the difference between NAT / Bridged / Host-Only networking?

VMWare: What is NAT vs. Bridged vs. Host-Only?
stevebot
  • 1,661
143
votes
8 answers

Impossible to put a zero after an aleph?

Me and a friend were joking about aleph's. Upon trying to type א0 (switch those 2 chars), they switched themselves! Any sequence of symbols does not stop this effect. Why is this!?? Try to type these with the 0 and א reversed (c&p for א): א0 א - …
Gradyn Wursten
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142
votes
5 answers

Why is serial data transmission faster than parallel?

Intuitively, you would think that parallel data transmission should be faster than serial data transmission; in parallel you are transferring many bits at the same time, whereas in serial you are doing one bit at a time. So what makes SATA…
modest
  • 1,436
142
votes
16 answers

du command does not parse hidden directories

I want to estimate the amount of disk space used by a directory using the following command. du -sh dir_name which does not calculate the hidden directories. In the man page of du there is no info regarding it. How to calculate the amount of disk…
Talespin_Kit
  • 3,391
142
votes
8 answers

How can I monitor the CPU temperature under linux?

How do I monitor and display the CPU temperature using Linux?
chris
  • 9,375
142
votes
1 answer

In macOS, how often is /tmp deleted?

How often is /tmp deleted? I thought it was cleaned out boot time and every three days if you don't reboot, but I can't find any authoritative source for this. I'm running the latest 10.6. (I suppose I would be interested in changes in this behavior…
zekel
  • 1,681
142
votes
6 answers

Does bash have a hook that is run before executing a command?

In bash, can I arrange for a function to be executed just before running a command? There is $PROMPT_COMMAND, which is executed before showing a prompt, i.e., just after running a command. Bash's $PROMPT_COMMAND is analogous to zsh's precmd…
Gilles 'SO- stop being evil'
  • 70,726
142
votes
11 answers

Why does my PC crash only when my cat is nearby?

I have a cat and he likes to walk around behind my desk, which is where my PC is. Somewhat frequently (at a rate of several times an hour) while he is doing this, the screen will suddenly turn black and after a few seconds, the fans stop spinning…
Stuntddude
  • 841
142
votes
9 answers

How do I type Home/End/PageUp/PageDown on a MacBook Pro?

What combination of keys (fn, control, option, command, arrow keys) is the equivalent of the Home key on a MacBook Pro? What about End/PageUp/PageDown?
Daryl Spitzer
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