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1500 questions
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votes
2 answers

Output from ls has newlines but displays on a single line. Why?

I think I may be overlooking a relatively fundamental point regarding shell. Output from the ls command by default separates output with newlines, but the shell displays the output on a single line. Can anyone explain this to me? I had always…
theconnorpower
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5 answers

So what are logical cpu cores (as opposed to physical cpu cores)?

I was googling about how I could find the number of CPUs in a machine and I found some posts but I am confused as some mentioned that you get the logical cores vs physical cores etc. So what is the difference between logical and physical cores and…
Jim
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78
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3 answers

What's the difference between single and double equal signs (=) in shell comparisons?

Read that for comparing strings inside if we need to use double square brackets. Some books says that comparison can be done by =. But it works with the == too. #!/bin/bash a="hello" b="world" if [[ $a == $b ]];then echo "equal" fi Is there a…
user3539
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78
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4 answers

grep lines starting with "1" in Ubuntu

I try to search for lines that start with "1" using ls -1 | grep ^1* but it returns lines that do not start with 1. What I am missing here?
Tim
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78
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3 answers

sshfs mount, sudo gets permission denied

I am using sshfs to mount a folder with some python projects over ssh to my ~/ directory. $ mkdir -p ~/mount/my-projects $ sshfs [email protected]:/home/user/my-projects ~/mount/my-projects I can perform most commands as could be expected: $ ls…
Uyghur Lives Matter
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78
votes
10 answers

Converting colored output into html

There are tools providing coloured output: dwdiff -c File1 File2 # word level diff grep --color=always # we all know this guy ... The question is: How to convert their colored output of arbitrary program into coloured html file? Other output…
Grzegorz Wierzowiecki
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78
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10 answers

View pdf file in terminal

I want to view pdf files directly on our cluster rather than copying them to my local machine and then opening them in a viewer. How can I view a pdf file in my terminal?
bioinformatician
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78
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12 answers

Mount Google Drive in Linux?

Now that Google Drive is available, how do we mount it to a Linux filesystem? Similar solutions exist for Amazon S3 and Rackspace Cloud Files.
blee
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78
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2 answers

Need explanation on Resident Set Size/Virtual Size

I found that pidstat would be a good tool to monitor processes. I want to calculate the average memory usage of a particular process. Here is some example output: 02:34:36 PM PID minflt/s majflt/s VSZ RSS %MEM Command 02:34:37 PM …
Flanfl
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78
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9 answers

Correctly determining memory usage in Linux

I'm a bit confused on some of the results I am seeing from ps and free. On my server, this is the result of free -m [root@server ~]# free -m total used free shared buffers cached Mem: 2048 2033 …
GoldenNewby
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78
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4 answers

How to OCR a PDF file and get the text stored within the PDF?

First, apologies if this has been asked before - I searched for a while through the existing posts, but could not find support. I am interested in a solution for Fedora to OCR a multipage non-searchable PDF and to turn this PDF into a new PDF file…
ingli
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78
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1 answer

What is the difference between a name and a label in gparted?

When I create a new partition on my disk using GParted, I have the option to set both a name and a label. Some partitions I have already have both, some only a label. If I right-click on an existing partition, I can see separate options to set the…
user168419
78
votes
6 answers

What is the correct way to view your CPU speed on Linux?

I found two commands to output information about my CPU: cat /proc/cpuinfo and lscpu. /proc/cpuinfo shows that my CPU speed is 2.1 Ghz, whereas lspcu says it is 3167 Mhz. Which one is correct? This is my exact output from cat /proc/cpuinfo about my…
Rohan
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78
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4 answers

$@ except the 1st argument

I need to write a shell script that runs in this way: ./myscript arg1 arg2_1 arg2_2 arg2_3 ....... arg2_# there is a for loop inside script for i in $@ However, as I know, $@ includes $1 up to $($#-1). But for my program $1 is distinctly…
user40780
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78
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6 answers

How to determine the maximum number to pass to make -j option?

I want to compile as fast as possible. Go figure. And would like to automate the choice of the number following the -j option. How can I programmatically choose that value, e.g. in a shell script? Is the output of nproc equivalent to the number…
tarabyte
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