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I have to put in a bash variable the first line of a file. I guess it is with the grep command, but it is any way to restrict the number of lines?
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To look at the first few lines of a file, type head filename, where filename is the name of the file you want to look at, and then press <Enter>. By default, head shows you the first 10 lines of a file.
The bash first line in script begins with a shebang (#!). These are two mandatory characters, after which is indicated which program you are using for scripting. Now it is bin / bash, but other programs use this mechanism. If you did not specify the program, bash will be used by default.
head takes the first lines from a file, and the -n parameter can be used to specify how many lines should be extracted:
line=$(head -n 1 filename)
to read first line using bash, use read statement. eg
read -r firstline<file
firstline will be your variable (No need to assign to another)
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