07-04-2016
DON'T mess around manually with important system files (like /etc/passwd), as
this thread may teach. And even less so do automatic mass changes with scripts... Use the respective system provided tools, e.g. usermod.
If you do, you should know EXACTLY what you are doing and how to reverse possibly wrong-going modifications.
This User Gave Thanks to RudiC For This Post:
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1. Shell Programming and Scripting
I have to replace a field in one file with a field from other file.
I came across this awk command to replace a field with one string
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I need to have something like cut -f2 -d "|" temp1 (a field from other file) instead of 'replace'
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2. Shell Programming and Scripting
Howdy.
I know this is most likely possible using sed or awk or grep, most likely a combination of them together, but how would one go about running a grep like command on a file where you only try to match your pattern to the second field in a line, space delimited?
Example:
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3. Shell Programming and Scripting
hi
i have file as below , i want to add duplicate records like bell_bb to one record with valuve as 15 ( addition of both )
any oneline awk script to achive this ?
header 0
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4. Shell Programming and Scripting
i have something like this,
cat filename.txt
hui this si s"dfgdfg" omeone ipaddress="10.19.123.104" wel hope this works
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i tried this
sed -i "s/'ipaddress'/'ipaddress=10.19.123.103'/g" filename.txt
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5. Shell Programming and Scripting
Hi Friends,
Need Help. I have file1.txt as
File1.txt
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Hi,
I am trying with the below Perl command to print the first field when the second field matches the given pattern:
perl -lane 'open F, "< myfile"; for $i (<F>) {chomp $i; if ($F =~ /patt$/) {my $f = (split(" ", $i)); print "$f";}} close F' dummy_file
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7. Shell Programming and Scripting
Hi all,
I have a requirement to replace a field with a character as per the length of the field.
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8. Linux
I have a .CSV file (file.csv) whose data are all enclosed in double quotes. Sample format of the file is as below:
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9. Shell Programming and Scripting
Hello,
I have a text file in the below format:
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10. Shell Programming and Scripting
I am trying to remove lines in the target.txt file if $5 before the - in that file matches sorted_list. I have tried grep and awk. Thank you :).
grep
grep -v -F -f targets.bed sort_list
grep -vFf sort_list targets
awk
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LEARN ABOUT DEBIAN
fsvs-url-format
FSVS - URL format(5) fsvs FSVS - URL format(5)
NAME
Format of URLs -
FSVS can use more than one URL; the given URLs are overlaid according to their priority. FSVS can use more than one URL; the given URLs
are overlaid according to their priority.
For easier managing they get a name, and can optionally take a target revision.
Such an extended URL has the form
['name:'{name},]['target:'{t-rev},]['prio:'{prio},]URL
where URL is a standard URL known by subversion -- something like http://...., svn://... or svn+ssh://....
The arguments before the URL are optional and can be in any order; the URL must be last.
Example:
name:perl,prio:5,svn://...
or, using abbreviations,
N:perl,P:5,T:324,svn://...
Please mind that the full syntax is in lower case, whereas the abbreviations are capitalized!
Internally the : is looked for, and if the part before this character is a known keyword, it is used.
As soon as we find an unknown keyword we treat it as an URL, ie. stop processing.
The priority is in reverse numeric order - the lower the number, the higher the priority. (See url__current_has_precedence() )
Why a priority?
When we have to overlay several URLs, we have to know which URL takes precedence - in case the same entry is in more than one. (Which is
not recommended!)
Why a name?
We need a name, so that the user can say 'commit all outstanding
changes to the repository at URL x', without having to remember the full URL. After all, this URL should already be known, as there's a
list of URLs to update from.
You should only use alphanumeric characters and the underscore here; or, in other words, w or [a-zA-Z0-9_]. (Whitespace, comma and
semicolon get used as separators.)
What can I do with the target revision?
Using the target revision you can tell fsvs that it should use the given revision number as destination revision - so update would go
there, but not further. Please note that the given revision number overrides the -r parameter; this sets the destination for all URLs.
The default target is HEAD.
Note:
In subversion you can enter URL@revision - this syntax may be implemented in fsvs too. (But it has the problem, that as soon as you
have a @ in the URL, you must give the target revision every time!)
There's an additional internal number - why that?
This internal number is not for use by the user.
It is just used to have an unique identifier for an URL, without using the full string.
On my system the package names are on average 12.3 characters long (1024 packages with 12629 bytes, including newline):
COLUMNS=200 dpkg-query -l | cut -c5- | cut -f1 -d' ' | wc
So if we store an id of the url instead of the name, we have approx. 4 bytes per entry (length of strings of numbers from 1 to 1024).
Whereas using the needs name 12.3 characters, that's a difference of 8.3 per entry.
Multiplied with 150 000 entries we get about 1MB difference in filesize of the dir-file. Not really small ...
And using the whole URL would inflate that much more.
Currently we use about 92 bytes per entry. So we'd (unnecessarily) increase the size by about 10%.
That's why there's an url_t::internal_number.
Author
Generated automatically by Doxygen for fsvs from the source code.
Version trunk:2424 11 Mar 2010 FSVS - URL format(5)