cut

问题 `-b BYTE-LIST' `--bytes=BYTE-LIST' Select for printing only the bytes in positions listed in BYTE-LIST. Tabs and backspaces are treated like any other character; they take up 1 byte. If an output delimiter is specified, (see the description of `--output-delimiter'), then output that string between ranges of selected bytes. `-c CHARACTER-LIST' `--characters=CHARACTER-LIST' Select for printing only the characters in positions listed in CHARACTER-LIST. The same as `-b' for now, but

问题 I have a 2GB file in raw format. I want to search for all appearance of a specific HEX value "355A3C2F74696D653E" AND collect the following 28 characters. Example: 355A3C2F74696D653E323031312D30342D32365431343A34373A30322D31343A34373A3135 In this case I want the output: "323031312D30342D32365431343A34373A30322D31343A34373A3135" or better: 2011-04-26T14:47:02-14:47:15 I have tried with xxd -u InputFile | grep '355A3C2F74696D653E' | cut -c 1-28 > OutputFile.txt and xxd -u -ps -c 4000000

问题 I am facing one issue with my source file. Consider I have following data in file- "dfjsdlfkj,fsdkfj,werkj",234234,234234,,"dfsd,etwetr" here, the delimiter is comma, but some fields have comma as a part of data. Such fields are enclosed in double quotes. I want to extract few columns from the file. If I use cut -d "," -f 1,3 then I am getting output like- "dfjsdlfkj,werkj" 回答1: I suggest you to use a csv parser. For example, python has one as a built-in module, so you only have to import it:

问题 I've a file which stores a directed graph. Each line is represented as node1 TAB node2 TAB weight I want to find the set of nodes. Is there a better way of getting union? My current solution involves creating temporary files: cut -f1 input_graph | sort | uniq > nodes1 cut -f2 input_graph | sort | uniq > nodes2 cat nodes1 nodes2 | sort | uniq > nodes 回答1: { cut -f1 input_graph; cut -f2 input_graph; } | sort | uniq No need to sort twice. The { cmd1; cmd2; } syntax is equivalent to (cmd1; cmd2)

问题 This IS kind of linked to another question - Code golf: "Color highlighting" of repeated text I'm tying to figure out a way of breaking a file into all 'n' characters long groups. Eg: If a file comprises of ONLY the following text: ABCDEFGHIJ And we want it broken into sets of 3, the output should be: ABC BCD CDE DEF EFG FGH GHI HIJ No characters in the file are to be treated any differently from another. ie, a "space" is just another character which should follow the rule above... 回答1: sed:

问题 I'm sure this is an easy one for the Gurus. I'm working on my get things done and todo system. At the moment I've simply got a markdown file which I edit in VI and set tags against my things to do. It looks like this # My project | @home - Do this this | @home I think sync this file across my devices and use tasker / grep on android to show me the todo based on where I am. I've now got to the stage where I want to add things to do in the future so I was thinking of something like - Do this

问题 I have two flac audio files, I need to cut them with different timecodes and then concatenated them using one single command line with ffmpeg. Is there a way to do it? I did something like that but it's not working very well, the timestamps of the outputs file are all messed up (instead of having an output flac beginning from 00:00 I have a file beginning from 59:90!!) Also this command line is insanely slow and it works only on unix system...hope someone could help me mkfifo temp1 temp2

问题 I'm very new to R so please be gentle. I have a dataset containing timestamps and some data. Now I'd like to draw a graph where: The data is grouped by e.g. 60 mins intervals and some percentile lines are drawn. I'd like to have a graph with the time as x-axis and the gap as y-axis. I imagine something like boxplot but for a better overview - since I have a long measurement - instead of boxes I'd like to have lines that connect the mean values, 3 percentiles, 97 percentiles and 100

问题 I have an input CSV file containing something like: SD-32MM-1001,"100.00",4/11/2012 SD-32MM-1001,"1,000.00",4/12/2012 I need to take out the formatting of numerical values for some other processing pipeline ( postgresql COPY ). Is there a text filter that will separate out the columns on FS without peeking inside quoted strings? Presently I get: $ tail +2 /tmp/foo.csv|awk -F, '{print NF}' 3 4 And similarly partial values for cut I have to stay on Linux. Thanks. 回答1: GNU awk can handle this

问题 The .NET Clipboard class has methods to put files into the clipboard and also define if they should be moved or copied (cut/copy). But if I want to paste files that were copied into the clipboard, I see no way to find out if the file was cut or copied with standard Clipboard methods. 回答1: The information is stored in a Clipboard data object named "Preferred DropEffect". A memory stream containing a 4-byte-array contains the enum value for System.Windows.DragDropEffects in the first byte: