bash

问题 I have a bash script to retrieve files from ftp. Now the files have one part a date string in the filename, but also undefined numbers that changes on every file. I want to download the files based on the date. This is my code. I only need to do the wildcard trick, the ftp script is allready work. filename=$(echo $TIMESTAMP'0***vel.radar.h5') The stars are 3 digits with different numbers that i can't estimate, so i would use the wildcard for them. Thank you 回答1: It sounds like you want to

问题 This question already has answers here : How to pass command output as multiple arguments to another command (5 answers) Closed 14 days ago . I try to pass this result in the third command -d argument, But i failed. $ cat asnlookups_domains_ip.txt | awk '{print $1}' | amass intel -whois -d flag needs an argument: -d 回答1: You could try xargs : cat asnlookups_domains_ip.txt | awk '{print $1}' | xargs -n1 amass intel -whois -d It passes the standard input as arguments after your command. 来源：

问题 I have a very simple question that I can't answer. In shell, what would this command do: test -d $VIRTUAL_ENV || virtualenv $VIRTUAL_ENV It seems like it tests if the virtualenv directory exists, but I dont understand what if does with that information. Will it always create the virtualenv afterwards, or would it only do it if it doesn't already exist? 回答1: The || is the OR condition. Hence, this will test if $VIRTUAL_ENV directory exists. If not, it will run virtualenv $VIRTUAL_ENV . Other

问题 I've Created RPM Package which contains shell script code which shown below. When I'm installing it in RedHat OS, It is not taking user input and continuously looping. If I run the same file manually it's working fine. If Anybody Knows Please let me know. set +e IpAddress='0' condition=1 while [[ $condition -ne 0 ]] do echo ' ' echo "PLEASE PROVIDE APPLIANCE IP" read IpAddress if valid_ip $IpAddress; then condition=0 else echo $IpAddress " IS INVALID IP PLEASE PROVIDE A VALID IP: " echo ' '

问题 I'm trying to add && \ on end of each line on a text file except the last line. Sample input: ps mkdir repo cd repo/ touch file1.txt Expected output: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt First attempt I tried this, but it outputs && \ on each line including the final line : awk '{print $0"&& \\"}' RS="\r*\n\r*" Second attempt I tried using sed: sed '1s/^//;$!s/$/"&&" \\/;$s/$//' This seems to add extra newlines: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt 回答1: You

问题 Well, as we all known, creating an alias in a terminal shell is quite easy: ZZ:~ zhangzhao$ alias c='uname' ZZ:~ zhangzhao$ c Darwin ZZ:~ zhangzhao$ But now I want to do the same thing through a Python3 script. I've checked the ref manual and found these sort of command work can be solved using subprocess module. Then I write the script below: import subprocess subprocess.call(["alias", "c=\'uname\'"]) But note that this operation will not take effect to the shell you are currently using,

问题 I'm trying to add && \ on end of each line on a text file except the last line. Sample input: ps mkdir repo cd repo/ touch file1.txt Expected output: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt First attempt I tried this, but it outputs && \ on each line including the final line : awk '{print $0"&& \\"}' RS="\r*\n\r*" Second attempt I tried using sed: sed '1s/^//;$!s/$/"&&" \\/;$s/$//' This seems to add extra newlines: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt 回答1: You

问题 Well, as we all known, creating an alias in a terminal shell is quite easy: ZZ:~ zhangzhao$ alias c='uname' ZZ:~ zhangzhao$ c Darwin ZZ:~ zhangzhao$ But now I want to do the same thing through a Python3 script. I've checked the ref manual and found these sort of command work can be solved using subprocess module. Then I write the script below: import subprocess subprocess.call(["alias", "c=\'uname\'"]) But note that this operation will not take effect to the shell you are currently using,

问题 I'm trying to add && \ on end of each line on a text file except the last line. Sample input: ps mkdir repo cd repo/ touch file1.txt Expected output: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt First attempt I tried this, but it outputs && \ on each line including the final line : awk '{print $0"&& \\"}' RS="\r*\n\r*" Second attempt I tried using sed: sed '1s/^//;$!s/$/"&&" \\/;$s/$//' This seems to add extra newlines: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt 回答1: You

问题 I'm trying to add && \ on end of each line on a text file except the last line. Sample input: ps mkdir repo cd repo/ touch file1.txt Expected output: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt First attempt I tried this, but it outputs && \ on each line including the final line : awk '{print $0"&& \\"}' RS="\r*\n\r*" Second attempt I tried using sed: sed '1s/^//;$!s/$/"&&" \\/;$s/$//' This seems to add extra newlines: ps && \ mkdir repo && \ cd repo/ && \ touch file1.txt 回答1: You