shell

问题 This question already has answers here : What does the $# construct mean in bash? [duplicate] (3 answers) Closed 5 years ago . I have a shellscript with the following lines: set -o nounset set -o errexit set -o xtrace if [ "$#" -ne 0 ] then echo 'A message' exit 1 fi Can somebody explain the commands, in particular the setter and the "$#" portion? 回答1: $# is the number of arguments passed to the script. So this if [ "$#" -ne 0 ] check ensures that if no arguments are passed then the script

问题 This question already has answers here : What does the $# construct mean in bash? [duplicate] (3 answers) Closed 5 years ago . I have a shellscript with the following lines: set -o nounset set -o errexit set -o xtrace if [ "$#" -ne 0 ] then echo 'A message' exit 1 fi Can somebody explain the commands, in particular the setter and the "$#" portion? 回答1: $# is the number of arguments passed to the script. So this if [ "$#" -ne 0 ] check ensures that if no arguments are passed then the script

问题 This question already has answers here : What does the $# construct mean in bash? [duplicate] (3 answers) Closed 5 years ago . I have a shellscript with the following lines: set -o nounset set -o errexit set -o xtrace if [ "$#" -ne 0 ] then echo 'A message' exit 1 fi Can somebody explain the commands, in particular the setter and the "$#" portion? 回答1: $# is the number of arguments passed to the script. So this if [ "$#" -ne 0 ] check ensures that if no arguments are passed then the script

问题 I made a Bash script that extracts words from a text file with grep and sed and then sorts them with sort and counts the repetitions with wc , then sort again by frequency. The example output looks like this: 12 the 7 code 7 with 7 add 5 quite 3 do 3 well 1 quick 1 can 1 pick 1 easy Now I'd like to merge all words with the same frequency into one line, like this: 12 the 7 code with add 5 quite 3 do well 1 quick can pick easy Is there any way to do that with Bash and standard Unix toolset? Or

问题 I made a Bash script that extracts words from a text file with grep and sed and then sorts them with sort and counts the repetitions with wc , then sort again by frequency. The example output looks like this: 12 the 7 code 7 with 7 add 5 quite 3 do 3 well 1 quick 1 can 1 pick 1 easy Now I'd like to merge all words with the same frequency into one line, like this: 12 the 7 code with add 5 quite 3 do well 1 quick can pick easy Is there any way to do that with Bash and standard Unix toolset? Or

问题 In jenkins build execute area I put these command: cd /var/lib/jenkins/workspace/test/ ng serve Here is the screenshot: I am getting an error like this: cd /var/lib/jenkins/workspace/test/ ng serve Environment variable TERM not defined! Build step 'Execute shell' marked build as failure Finished: FAILURE node v6.10.0 @angular/cli: 1.0.6 Please help me to resolve this issue. 回答1: Try this I did jenkins integration today. npm run ng build This is working fine. 回答2: In my case my slave Jenkins

问题 I have my data in a file store by lines like this : 3.172704445659,50.011996744997,3.1821975358417,50.012335988197,3.2174797791605,50.023182479597 And I would like 2 columns : 3.172704445659 50.011996744997 3.1821975358417 50.012335988197 3.2174797791605 50.023182479597 I know sed command for delete ','(sed "s/,/ /") but I don't know how to "back to line" every two digits ? Do you have any ideas ? 回答1: One in awk: $ awk -F, '{for(i=1;i<=NF;i++)printf "%s%s",$i,(i%2&&i!=NF?OFS:ORS)}' file

问题 Here's one method I found which brings the IE ComObject window to the foreground and uses SendKeys. How would I send a sequence of key presses using this method? $ie = New-Object -ComObject InternetExplorer.Application $ie.navigate("www.google.com") do {sleep 1} until (-not ($ie.Busy)) Add-Type -AssemblyName System.Windows.Forms Add-Type @" using System; using System.Runtime.InteropServices; public class StartActivateProgramClass { [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType

问题 I'm trying to use an alias in a shell script I'm writing, but it is not working. The alias: alias ts="awk '{ print strftime(\"[%Y-%m-%d %H:%M:%S]\"), \$0 }'" When I run the script, I get the following error: ./copyTask.sh: ts: not found Sooping around on the internet, it seems that I need to enable the expand_aliases shell option, but I don't have shopt installed... Is there any way I can enable alias expansion without using shopt or creating another rootfs image? I'm using the ash shell. And

问题 This question already has answers here : How do I iterate over a range of numbers defined by variables in Bash? (20 answers) Closed 5 years ago . If I do this, I get the result as expected. for i in {125..129}; do echo $i; done 125 126 127 128 129 But when I do this? I get something weired. for i in {$((1+(25-1)*500))..$((25*500))}; do echo $i; done {12001..12500} I wish to pass a variable inside the loop variables like $((1+($j-1)*500)) 回答1: Bash's brace expansion has limitations. What you