shell

问题 I have used pkgbuild to create a default Component Property List file. The file looks like: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList- 1.0.dtd"> <plist version="1.0"> <array> <dict> <key>BundleHasStrictIdentifier</key> <true/> <key>BundleIsRelocatable</key> <true/> <key>BundleIsVersionChecked</key> <true/> <key>BundleOverwriteAction</key> <string>upgrade</string> <key>RootRelativeBundlePath</key> <string

问题 I'm building a shell script (trying to be POSIX compliant) and I'm stuck in an issue. The script is supposed to receive an URL and do some things with it's content. myscript www.pudim.com.br/?&args=ok The thing is, the ampersand symbol is interpreted as a command additive, and giving to my script only the www.pudim.com.br/? part as an argument. I know that the right workaround would be to surround the URL with quotes but, because I need to use this script several times in a row, I wanted to

问题 I need to escape single quotes in a variable. ssh_command 'file=$(hostname)_server-setup_$(date +%Y-%m-%d).tar.gz && cd /var && tar -zcvf $file ini | wc -l | xargs printf \'Num files: %d, File: $file\'' I can surround the variable with double quotes but then the internal variables will be evaluated when the variable is declared, and that's not what I want. ssh_command "file=$(hostname)_server-setup_$(date +%Y-%m-%d).tar.gz && cd /var && tar -zcvf $file ini | wc -l | xargs printf 'Num files:

问题 I have a problem with a simple subtraction but I don't understand what's wrong. My code : start= date +%s%N | cut -b1-13 #Treatment... end= date +%s%N | cut -b1-13 delta=`expr $end - $start` echo "delta $delta" My console display : 1374652348283 ... 1374652349207 delta - My question is : Why do I got a - symbol returned ? 回答1: The command: a= b (note the space) will set a to an empty string while it runs the command b . It's a way to temporarily set environment variables for a single command,

问题 I need to implement a script (duplq.sh) that would rename all the text files existing in the current directory using the command line arguments. So if the command duplq.sh pic 0 3 was executed, it would do the following transformation: pic0.txt will have to be renamed pic3.txt pic1.txt to pic4.txt pic2.txt to pic5.txt pic3.txt to pic6.txt etc… So the first argument is always the name of a file the second and the third always a positive digit. I also need to make sure that when I execute my

问题 I need to implement a script (duplq.sh) that would rename all the text files existing in the current directory using the command line arguments. So if the command duplq.sh pic 0 3 was executed, it would do the following transformation: pic0.txt will have to be renamed pic3.txt pic1.txt to pic4.txt pic2.txt to pic5.txt pic3.txt to pic6.txt etc… So the first argument is always the name of a file the second and the third always a positive digit. I also need to make sure that when I execute my

问题 i want to insert a query but not work : my $query1 = $db1->prepare("SELECT host, name, severity FROM XX"); my $query2 = $db2->prepare('UPDATE worldmap_table' . ' SET severity = ?, name = ? WHERE HOST = ?'); $query1->execute; while (my @row = $query1->fetchrow_array) { $query2->execute($row[2]); print "$row[2]\n"; } preparation query 3 my $query3 = $db1->prepare("SELECT host, name, severity FROM XX); preparation query 4 my $query4 = $db2->prepare('UPDATE worldmap_table' . ' SET severity = 6,

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 am using Python to call a Shell script with def run_command(cmd): print "Start to run: " + cmd run = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while True: line = run.stdout.readline().decode()[:-1] if line == '' and run.poll() is not None: break print line # print the log from shell recode = run.returncode if recode != 0: raise Exception("Error occurs!") print "End to run: " + cmd Then I run run_command("sh /home/tome/a.sh") I notice the console