How can I check if a program exists from a Bash script?

bash
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In the shell, what does " 2>&1 " mean?

bashshellunixredirect
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Read a file line by line assigning the value to a variable

bash
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How can I use a file in a command and redirect output to the same file without truncating it?

iobashredirect
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Pass commands as input to another command (su, ssh, sh, etc)

bashshellunixshssh
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