how to fix the issue “Command /bin/sh failed with exit code 1” in iphone
Click On Run checkbox if not selected.
shell
Using sudo with Python script
Try this and let me know if it works. 🙂 And this one: os.popen(“sudo -S %s”%(command), ‘w’).write(‘mypass’)
dquote> result of a execution a program in linux shell
It means you’ve executed a line of code with only one double-quote character, like this: The shell is waiting for the other quote.
Is there a TRY CATCH command in Bash
Is there a TRY CATCH command in Bash? No. Bash doesn’t have as many luxuries as one can find in many programming languages. There is no try/catch in bash; however, one can achieve similar behavior using && or ||. Using ||: if command1 fails then command2 runs as follows Similarly, using &&, command2 will run if command1 is successful The closest approximation of try/catch is as follows Also bash contains some error … Read more
What is the $? (dollar question mark) variable in shell scripting?
$? is used to find the return value of the last executed command. Try the following in the shell: If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default “success” return value). If it doesn’t exist, you should get a number other then 0. The … Read more
python getoutput() equivalent in subprocess
Use subprocess.Popen: Note that communicate blocks until the process terminates. You could use process.stdout.readline() if you need the output before it terminates. For more information see the documentation.
How do I set a variable to the output of a command in Bash?
In addition to backticks `command`, command substitution can be done with $(command) or “$(command)”, which I find easier to read, and allows for nesting. Quoting (“) does matter to preserve multi-line variable values; it is optional on the right-hand side of an assignment, as word splitting is not performed, so OUTPUT=$(ls -1) would work fine.
Open and write data to text file using Bash?
The short answer: However, echo doesn’t deal with end of line characters (EOFs) in an ideal way. So, if you’re gonna append more than one line, do it with printf: The >> and > operators are very useful for redirecting output of commands, they work with multiple other bash commands.
What does the line “#!/bin/sh” mean in a UNIX shell script?
It’s called a shebang, and tells the parent shell which interpreter should be used to execute the script. Most scripting languages tend to interpret a line starting with # as comment and will ignore the following !/usr/bin/whatever portion, which might otherwise cause a syntax error in the interpreted language.
How can I compare numbers in Bash?
In Bash, you should do your check in an arithmetic context: For POSIX shells that don’t support (()), you can use -lt and -gt. You can get a full list of comparison operators with help test or man test.