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1500 questions
144
votes
4 answers
How do I pass a list of files to grep
I am using find and getting a list of files I want to grep through. How do I pipe that list to grep?
Tegra Detra
- 5,016
144
votes
3 answers
grep on a variable
Let's say I have a variable
line="This is where we select from a table."
now I want to grep how many times does select occur in the sentence.
grep -ci "select" $line
I tried that, but it did not work. I also tried
grep -ci "select" "$line"
It…
gkmohit
- 3,309
144
votes
7 answers
Cause a script to execute after networking has started?
I am relatively new to systemd and am learning its architecture.
Right now, I'm trying to figure out how to cause a custom shell script to run. This script needs to run after the networking layer has started up.
I'm running Arch, using systemd as…
fdmillion
- 2,828
144
votes
6 answers
Where do files go when the rm command is issued?
Recently I accidentally did rm on a set of files and it got me thinking where exactly these files end up?
That is to say, when working with a GUI, deleted files go to the Trash. What's the equivalent for rm and is there a way of undoing an rm…
boehj
- 2,630
143
votes
7 answers
Why is cd not a program?
I've always wondered why cd isn't a program, but never managed to find the answer.
Anyone know why this is the case?
AkshaiShah
- 3,629
143
votes
1 answer
Why eval the output of ssh-agent?
In order to run ssh-agent I have to use:
eval $(ssh-agent)
Why is it necessary to eval the output of ssh-agent? Why can't I just run it?
jx12345
- 1,640
143
votes
3 answers
Pass command line arguments to bash script
I am new to bash script programming.
I want to implement a bash script 'deploymLog', which accepts as input one string argument(name).
[root@localhost Desktop]# ./deploymLog.sh name
here I want to pass the string argument(name) through command line…
chinchu
143
votes
7 answers
When is xargs needed?
The xargs command always confuses me. Is there a general rule for it?
Consider the two examples below:
$ \ls | grep Cases | less
prints the files that match 'Cases', but changing the command to touch will require xargs:
$ \ls | grep Cases |…
Zaid
- 10,642
143
votes
12 answers
Is there a simple linux command that will tell me what my display manager is?
Is there a simple linux command that will tell me what my display manager is?
I'm using Xfce. Are different desktop environments usually affiliated with different display managers?
ptrcao
- 5,635
143
votes
6 answers
Setting a name for a screen session
Is there a way to give a particular name to a unix screen session? For instance, say I'm running the same program multiple times, each with different parameters and I want to tell which one is which.
well actually
- 3,225
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- 11
142
votes
4 answers
Is there a ".bashrc" equivalent file read by all shells?
Is ~/.bashrc the only place to specify user specific environment variables, aliases, modifications to PATH variable, etc?
I ask because it seems that ~/.bashrc seems to be bash-only, but other shells exist too…
Stefan
- 25,300
142
votes
23 answers
Is there a way to get the min, max, median, and average of a list of numbers in a single command?
I have a list of numbers in a file, one per line. How can I get the minimum, maximum, median and average values? I want to use the results in a bash script.
Although my immediate situation is for integers, a solution for floating-point numbers…
Peter.O
- 32,916
142
votes
8 answers
Long line wrapping in Nano
When editing an authorised_keys file in Nano, I want to wrap long lines so that I can see the end of the lines (i.e tell whose key it is). Essentially I want it to look like the output of cat authorised_keys
So, I hit Esc + L which is the meta key…
codecowboy
- 3,442
141
votes
4 answers
What is the difference between reboot , init 6 and shutdown -r now?
I just want to know difference between in
reboot
init 6
shutdown -r now
and which is the safest and the best?
Rahul Patil
- 24,711
141
votes
5 answers
Difference between /bin and /usr/bin
I read this up on this website and it doesn't make sense.
http://rcsg-gsir.imsb-dsgi.nrc-cnrc.gc.ca/documents/basic/node32.html
When UNIX was first written, /bin and
/usr/bin physically resided on two
different disks: /bin being on a
smaller…
whoami
- 3,870