Filter out negative values bash
WebJul 29, 2013 · How can i accomplish number comparison involving negative numbers? if [ [ "-2" > "-1" ]]; then echo "-2 >-1" else echo "-2 <=-1" fi. I also tried. if [ '-2' -lt '-1' ]; then. but the condition always behaves as if -2 would be greater than -1. The comparisons work … WebNov 27, 2014 · If you also want to filter these results on negative numbers, you could grep for ^- in the results of the above script, or grep for it in the results of each (or just the first) cut command, or add the following line just inside the outer for loop: if [ [ "$ {parentId:0:1}" != '-' ]]; then continue; fi; Alternative approach:
Filter out negative values bash
Did you know?
WebJan 7, 2014 · I need some help with a bash mathematical expression script. I need the expression below to be a negative 2 to the power of 63 but I have tried all sorts of combinations from "", '', (()) and even keeping the positive value but multiplying it by -1 but I can't seem to get the syntax right. Original expression: kw=`expr 2^63 bc` WebApr 14, 2024 · Using AWK to filter out column with numerical ranges. I'm relatively new to BASH and I'm trying to use awk to filter out column 1 data based on the 4th column of a text file. If the 4th column of data matches the range of x, then it'll output column 1 data. "x" is suppose to be a range of numbers 1-10 (1,2,3..10).
WebSep 22, 2008 · To filter out the blank lines, you can use grep: grep -v '^\s*$' *.py wc. '-v' tells grep to output all lines except those that match '^' is the start of a line '\s*' is zero or more whitespace characters '$' is the end of a line *.py is my example for all the files you wish to count (all python files in current dir) pipe output to wc. WebYou can try using cut to cut out the columns you are interested in. tail -f whatever cut -d ' ' -f 3- [PROD] - INFO: GET 200 - 5ms [PROD] - INFO: POST 200 - 7ms This -d sets a …
WebMar 6, 2009 · Given the following input: class jar jar jar bin bin java. uniq will output all lines exactly once: class jar bin java. uniq -d will output all lines that appear more than once, and it will print them once: jar bin. uniq -u will output all lines that appear exactly once, and it will print them once: class java. WebOct 15, 2024 · Python Pandas: DataFrame filter negative values 96,639 Solution 1 You could loop over the column names for cols in data.columns.tolist () [1:]: data = data.ix [data[cols] > 0] Solution 2 You can use all to check an entire row or column is True:
WebSep 7, 2024 · awk '$1 *= -1' flips negative to positive and the other way around at the same time, so if one.txt contains values that are already negative, they'll turn positive. Strictly speaking, that's not what you asked, but might of course be what you meant. You'd need something like $1 > 0 {$1 *= -1} {print} to only flip positive to negative. –
WebNo, just negative and positive floats would be fine. – ahajib Jun 20, 2016 at 19:40 Add a comment 2 Answers Sorted by: 18 grep works well for this: $ echo "2.5 test. test -50.8" grep -Eo ' [+-]? [0-9]+ ( [.] [0-9]+)?' 2.5 -50.8 How it works -E Use extended regex. -o Return only the matches, not the context [+-]? [0-9]+ ( [.] [0-9]+)?+ attention mask怎么翻译WebThe first tr deletes special characters. d means delete, c means complement (invert the character set). So, -dc means delete all characters except those specified. The \n and \r are included to preserve linux or windows style newlines, which I assume you want. The second one translates uppercase characters to lowercase. Share. Improve this answer. attendo rajamäkiattijari mailWebAug 22, 2014 · if [ [ $scale =~ [^0-9] ]] is less convoluted. Doing so, puts the negation in the regular expression instead of the test condition. See below. – Serge Stroobandt Apr 14, 2024 at 16:04 A POSIX solution might be similar to See below. – user232326 May 27, 2024 at 1:09 Add a comment 35 Use -eq operator of test command: attention on va manoeuvrerWebAug 6, 2024 · Return negative in Unix Shell Script Functions. in a script, I am returning negative integer from a function. I one envrionment with Bash Version : GNU bash, version 3.2.51 (1)-release (x86_64-suse-linux-gnu) the script is running. and in other envrionment with Bash Version : GNU bash, version 4.2.46 (2)-release (x86_64-redhat-linux-gnu) the ... attendo kurjenmiekka kouvolaWebAug 9, 2016 · Using AWK to Filter Rows. 09 Aug 2016. After attending a bash class I taught for Software Carpentry, a student contacted me having troubles working with a large data file in R. She wanted to filter out rows based on some condition in two columns. An easy task in R, but because of the size of the file and R objects being memory bound, … attijari harhouraWebMar 22, 2013 · 9,515 6 67 94 2 xargs would pass each line of the output as an independent argument to grep. grep is very much capable of reading from stdin when you pipe the output of cat. So merely removing xargs should work. The -l option to grep is not really required for your use case. And if you do use -l it should be before the pattern and not after ;) attentat 21 juli