General :: Keep Last 'n' Characters Of A Specified Field?
Apr 4, 2010
The input file consists of several fields. The first field is always five or more characters long. I want to keep the last five characters of the first field.
Example:
If the input file record is FEDERAL PACIFIC ELECTRIC PRODUCTS then I want to keep DERAL I can do this in four steps by using C, REV, C, and REV again but that seems like doing an easy thing the hard way. Is there a straightforward way to achieve this result with C or some other command?
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May 4, 2010
This is mostly an FYI. I have been messing around with an old desktop to see what I could do.
I installed an image of XP, then tried installing Ubuntu. I chose the option to install along side XP, and adjusted the partition size. The install gets to the point where I create my password, and I get exactly 4 characters entered in the first password field and it freezes. It did the same thing on two consecutive installation attempts.
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May 18, 2010
I've had a very colorful morning learning the innerparts of Linux's sort command, and have come across yet another issue that I can't seem to find an answer for in the documentation. I'm currently using -t, to indicate that my fields are split by the comma character, but I'm finding that in some of my files, the comma is used (between double-quotes) within values:
Jonathan Sampson,,foo@bar.com,0987654321
"Foobar CEO,","CEO,",ceo@foobar.com,,
How can I use a comma to terminate my fields, but ignore the occurences of it within values? Is this fairly simple, or do I need to re-export all of my data using a more-foreign field-terminator? (Unfortunately, I do not have any control over declaring a different terminator with this particular project).
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Mar 28, 2010
I'm trying to display fields from flat files where the first 8 fields are always the same. Fields 9 - n are varied but will contain specific patterns I'm after. I'm using this so far because "mySearch" is on each line I want to examine.
Code:
How would you pattern match and include 2 additional fields above field $9 but change field position from line to line?
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Aug 28, 2011
While modifying the definition of my PS1, I saw that "[" and "]" markers should be added to help bash to compute the right display lenght. Many exemples on the web do not use them or even mention them.I searched for a solution to add them automatically, like with sed, but I didn't find any example.Are they still needed and is there a recommandation not to use sed to define PS1?
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Jan 8, 2010
How can print the, let's say 5nd field to the last field of every record (let's say we have 10 fields)?
I mean: I cant avoid to have to do:
print '{$5 $6 $7 $8 $9 $10}'
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Apr 27, 2009
I am creating a game with random variables. In the game I have created a dialogue exchange to players. I have set up a table with various returns and I inserted {$fields} to represent various random variables. When I call on the requested fields, I only see the field text and my field names. Am I supposed to parse something and call it back another way?
ie: myfield is: "You have won {$random1} silver! <br />{$wi['gender'] majesty rewards you well." the code I am using to call that field is:
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Dec 14, 2010
i have a file : file.dat with following data
Code:
STORAGE PERCENTAGE FLAG:
/storage_01 64% 0
/storage_02 17% 1
/storage_03 10% 0
/storage_04 50% 1
I need to get the value of PERCENTAGE in a variable for a value of storage passed as variable i have tried the following without success like :
Code:
percentage='awk -vx="$defaultStorage" '{FS=OFS=" "}$1==x{print $2}1' file.dat
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Mar 1, 2011
I am using a cluster of machines running on Ubuntu 10.04 LTS which are supposed to be homogeneous, but apparently they are not. In particular, I am configuring the X server on these machines.The problem is that the BusID of the graphic card is PCI:5:0:0 for some machines, and PCI:3:0:0 for others. Is there a way that the X server automatically detects the appropriate Device (based on the name for instance)?
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Sep 1, 2010
I have one file placed at one server whose sample as follows:
57272 28
56767 0
57575 4
[code]...
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Jun 1, 2010
i have 2 file and want to merge them in the first one. the first file is like this:
2 word1
1 word2
6 word3
2 word4
......
the second:
word1 :file1 :file2
word2 :file6
word3 :file1 :file2 :file2 :..up to file6
word4 :file7 :file1
.......
So i want to ADD all those File fiels Wich have different FN for every record.
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Apr 24, 2010
I have a file containing text. I want to replicate a specific field.For example, I might want to append a copy of the second word of each line to the end of that line.Have: Once upon a midnight dreary, while I pondered weak and weary,Over many a quaint and curious volume of forgotten lore, Want: Once upon a midnight dreary, while I pondered weak and weary, upon Over many a quaint and curious volume of forgotten lore, many Is there a Linux command which will do this? I seek a basic command, not awk, not Perl, because I haven't learned those things yet.
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Sep 27, 2010
I would like to know the command to change or add GECOS field of existing user. when i tried to find the command i end up getting this which is only valid for new user account.
Code:
useradd --help
-c, --comment COMMENT set the GECOS field for the new user account
My system details.
Code:
# lsb_release -a
LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: OracleVMserver
Description: Oracle VM server release 2.2.0
Release: 2.2.0
Codename: n/a
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Sep 1, 2010
In my file there are 2 fields separated by space.Sample content of file are as follows:56060 154242 053030 0Now i want to check second field of the file and if all values in second field are 0(zero) and send mail containing all contents of the file
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Jul 8, 2011
What command could I use in terminal to delete all ASCII characters? That is, delete a-z, A-Z, 0-9, and all punctuation? I have a file containing Chinese characters, and I want to remove everything else and leave just the Chinese.
I can use grep to leave only the lines that have Chinese in them, but this still leaves a lot of non-Chinese stuff on those lines. Does anyone know how I could actually remove everything that isn't Chinese?
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Apr 21, 2010
Here's the bash script:
Code:
FILES="/usr/sbin/accept
/usr/sbin/pwck
/usr/sbin/chroot
/usr/bin/fakefile
[code]....
Notice the extra" file size" lines in there? What's causing that? I'm trying to learn more bash skills. I have no experience with awk because I have been unable to understand it's basic necessity. But I thought maybe if I try it with some test scripts I might become more interested in using it more and expand my very limited capabilities.
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May 18, 2011
I have a file that contains 5 fields and anothen one with two I want to take the value from user and search file1 and if the value exists then write in file2 to the $2 to the line that $1=value
file 1
1:fsdfsd:g:33:fsdf
2:yytgdcf:a:3:sgd
3:tttt:g:67:yujhggfg
[code].....
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Dec 2, 2010
I am trying to remove the space between the 2nd and 3rd fields but just cannot work out how to do it. I've considered sed, cut, awk...I know with sed you can replace all instances within a file but can you also specify to remove, say, the 2nd instance of a space in each line (this would be perfect for me)?
DAAE 60 402 Bejaia Algeria 1 36-43N 005-04E 36-43N 005-04E 2 2 P
DAAG 60 390 Dar-El-Beida Algeria 1 36-43N 003-15E 36-43N 003-15E 25 25 P
DAAJ 60 670 Djanet Algeria 1 24-33N 009-28E 24-33N 009-28E 1054 1054 P
[code]...
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Feb 11, 2011
I want to select lines from FileA based on a key field in FileB.
egrep does this nicely:
"egrep -w '0132874|0132880|0100765' < " FileA
Suppose FileB consists of three lines:
0132874
0132880
0100765
Is there a way to code egrep to do the selection? I really like code which does not use explicit loops so my interest is to find a grep or egrep or sed (or some other) command to perform this function.
Neither file is sorted on the key field but they could be. There is no requirement to keep the files in their present order.We may assume that each key value in each file is unique.
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Jun 16, 2010
I have my OpenSuse 11.1 box set up with utf-8, however, every time I try to open a file with utf-8 characters with vi it can't handle those characters properly.
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Jan 11, 2011
hi, i am about to complete my BCA this year...and i want to make my field in networking...so i want to know that whether y should do Cisco Certifications or Red Hat Certifications....please tell me...
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Dec 29, 2010
I often use VNC to connect to my desktop upstairs using a laptop downstairs over my home network. I tunnel the VNC connection via SSH. The problem I keep running into is that I'll attempt to type a ! or a : or even a captial A and it will come across the wire as a 1, ;, or a respectively. Is this something I can fix? It's really REALLY annoying while one is programming to have to pop open character map and find a colon and copy/paste it in each time. Running Ubuntu 10.04 upstairs, Linux Mint 10 downstairs.
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Aug 17, 2010
any tips from you guys on how to filter my awk output?I want to exclude last 5 characters using awk in my tcpdump result.I don't want to include ".443:" in my tcpdump using awk.
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Nov 1, 2010
We have a list of cyclones in the world. Now i got to check whether or not the second field is more than 1000 mm. If so, than the line has to have a[*] at the end of the line. For exemple:
Australia:1411:55.55:Mackay Cyclone 1918:1918:Mackay
to
Australia:1411:55.55:Mackay Cyclone 1918:1918:Mackay[*]
I also have to use a substitute. So far i've got this but it fails, 6,$s/([0-9])111:1/.* [*]
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Nov 4, 2010
How many characters does Linux recognize on usernames?
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Nov 2, 2010
I have a file with a random word on each line (3k+ lines). How can I get the lines with only five characters? I tried using grep file | more, but it returns all the words (even those less than 5 characters).
Edit: I also tried grep '.{5}' file | more but it doesn't show anything. And grep '.{5}' file | more returns all lines with four or more characters (I'm really confused about why it's doing this).
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Sep 3, 2010
Say I had a string like so
Let's say I only wanted to grab TAC and BDX the ones in the 2nd, 4th, and 6th spot.
Will grab the lines from the rest of the file assuming these are the only lines with capital letters at the very beginning of each line.
Will delete the first 'T'. What I want to do is learn how to just pick the even characters, T(T)A(A)C(C) & B(B)D(D)X(X).
Is there something like the {1} which can pick just the even or odd character matches?
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Apr 17, 2009
I would like to modify the content of a text file in Linux, in the following way:=> the file has several of these lines:./run_pest3 ./g134366.04080_0.062 x 2_d043 1 0.43 results_EC=> I want to modify all lines to be:./run_pest3 ./g134366.04080_0.062 x 2_d043 1 0.43 results_EC0.062i.e., the last number of $2 should be "attached" to the end of $7, for each line.
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Jun 9, 2010
I am using a Swedish keyboard, and I want to be able to type braces easier.
I planned to map AltGr + to '}' and AltGr + to '{'. However, nothing really changes. I have some other stuff in my .Xmodmap so I know that it gets loaded allright. Here's what I have so far:
keycode 35 = slash asciitilde dead_ogonek section dead_ogonek section
keycode 49 = asciicircum onehalf
keycode 66 = F10
clear Lock
[Code]....
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Sep 13, 2010
Any time the word The appears at the beginning of a line, I want to move it to the end of the line and capitalize the new first word in the line. For example, The heaven becomes Heaven the. I'm trying to test this out for my Library.
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