Linked Questions
11 questions linked to/from Differences between sed on Mac OSX and other "standard" sed?
430
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4
answers
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What characters do I need to escape when using sed in a sh script?
Take the following script:
#!/bin/sh
sed 's/(127\.0\.1\.1)\s/\1/' [some file]
If I try to run this in sh (dash here), it'll fail because of the parentheses, which need to be escaped. But I don't need ...
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176
votes
5
answers
71k
views
What exactly is POSIX?
I see POSIX mentioned often and everywhere, and I had assumed it to be the baseline UNIX standard.. until I noticed the following excerpt on a Wikipedia page: The Open Group
The Open Group is most ...
- 33.8k
58
votes
11
answers
162k
views
How can I "grep" patterns across multiple lines?
It seems I am misusing grep/egrep.
I was trying to search for strings in multiple line and could not find a match while I know that what I'm looking for should match. Originally I thought that my ...
- 10.6k
37
votes
4
answers
12k
views
Evolution of Operating systems from Unix
Can you explain the evolution hierarchy of operating systems (Linux and Windows) from Unix?
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4
votes
4
answers
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sed command to replace a blank line with two lines of content
How do I replace the first blank line with two lines of content? I did see a question on replacing multiple blank lines with a single blank line in vim sed but don't quite see how to adapt that. So, ...
- 1,673
4
votes
6
answers
10k
views
Use sed command to check if a particular line exists, if not, add it
I want to add more terminals to the file /etc/securetty. More specifically I would like to add pts/n, where n is in the range 0-9, if it does not exist. Is this possible through sed command? The ...
- 791
3
votes
8
answers
3k
views
How to convert dashed string to spaces and caps?
Given the string foo-bar, what is a good way to convert it to Foo Bar?
Using Bash, OSX.
- 8,529
0
votes
1
answer
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views
ERROR : invalid command code ~
I am actually learning about sed command tutorial , where I am running below command in order to print the line 1st,4th,7th,10th,13th ..... line from Notes.txt.
I am using MAC terminal
sed -n '1~3p' ...
4
votes
1
answer
967
views
How to use sed to replace two instances of the same digits separated by a slash with one instance of those digits?
I want to use sed to replace two instances of the same digits separated by a slash with one instance of those digits. My input files have lines like this:
text (1982/1982) text
text (1983/1983) text
...
- 143
1
vote
2
answers
365
views
SSH Config Host Autocomplete Command not Autocompleting
I wrote a function to get my hosts from ssh config without getting wildcard hosts:
sshConfAutoComplete() {
cat ~/.ssh/config | \
grep 'host ' | \
sed '
s#.*\*##g;
s#host ##g
...
- 554
0
votes
2
answers
147
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Reading specific lines from input file
I have an input file with this general structure. I only want to extract the values step and weight from the hill blocks and put them into a output file using awk/sed/grep. Hill blocks are arranged ...
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