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Bash String Comparison: Find Out IF a Variable Contains a Substring

How do I determine whether a variable called spath="/srv/www/cyberciti.biz/https" contains a substring called "cyberciti.biz"?
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pdfinfo: Find Out PDF File Information From A UNIX / Linux Shell Prompt

Q. How do I find out more information about Portable Document Format (PDF) document from a shell prompt? How do I find out information such as what software used to create a pdf file, its page size, and its creation date etc, using the terminal?
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pdftotext: Linux / UNIX Convert a PDF File To Text Format

Question: I've downloaded configuration file in a PDF format. I do not have GUI installed on remote Linux / UNIX server. How do I convert a PDF (Portable Document Format) file to a text format using command line so that I can view file over remote ssh session?
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pdfimages: Extract and Save Images From A Portable Document Format ( PDF ) File

Q. How do I extract images from a PDF file under Linux / UNIX shell account?
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Bash Shell Loop Over Set of Files

How do I run shell loop over set of files stored in a current directory or specified directory?
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Find Files By Access, Modification Date / Time Under Linux or UNIX

I do not remember where I saved pdf and text files under Linux. I have downloaded files from the Internet a few months ago. How do I find my pdf or text files?
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