If the variables contain spaces or other unusual characters it will probably cause the script to fail. The reason for this is explained by 8jean in another answer. I have written the following shell to count the number of lines starting with the pattern of ' A valA B valB'. Or, to get raw output instead of JSON: jq -r '.Vpc.VpcId' infile vpc-123. grep for expression containing variable (2 answers) Closed 10 years ago. A jq solution would be as simple as this: jq '.Vpc.VpcId' infile 'vpc-123'. Unlike the fork(2) POSIX system call, childprocess.fork() does not clone the current. Apart from jq mentioned in another answer, I know of. variable NODECHANNELFD on the child process. Take particular note of the double-quotes used to wrap the variables. But, as mentioned, you'd be better off properly parsing your JSON. # Symbolic link specific commands go here. So symbolic links may have to be treated differently, if subsequent commands expect directories: if then Will produce the error message: rmdir: failed to remove `symlink': Not a directory This step works as the variable is printed out properly. Therefore I loop through the lines of the first file and assign the name to the variable pattern. Each of them I want to use as a pattern for grep in order to search them in another file. running this: ln -s "$ACTUAL_DIR" "$SYMLINK" So here's what I try to do: I have two files. However, as Jon Ericson points out, subsequent commands may not work as intended if you do not take into account that a symbolic link to a directory will also pass this check.Į.g. Thanks, I replaced the variables with the sed command, but it generates a space at the beginning of the line which causes the grep to fail. # Control will enter here if $DIRECTORY doesn't exist. Or to check if a directory doesn't exist: if then The way you use grep here will use the user-supplied string as a regular expression (a pattern, such as cat.dog), not necessarily as a plain fixed string. # Control will enter here if $DIRECTORY exists. Don't single-quote the variable (it will prevent the shell from expanding its value). $ $EDITOR test/test.To check if a directory exists in a shell script, you can use the following: if then Or as a development dependency for your project: $ npm install -save-dev mochaĪs of v10.0.0, Mocha requires Node.js v14.0.0 or newer. Install with npm globally: $ npm install -global mocha Test Fixture Decision-Tree Wizard Thing.arbitrary transpiler support (coffee-script etc).before, after, before each, after each hooks.extensible reporting, bundled with 9+ reporters. A cross-platform python implementation of grep pygrep hooks are a quick way. easily meta-generate suites & test-cases We copied and pasted unwieldy bash scripts from project to project and had.If there is no output (text does not exist) I will exit.
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