Drugie_21
0 21 informačný list michalesq
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chown apache: apache -R /var/www recursively sets the owner to all files and directories under /var/www/ to apache and the group ownership to apache (This would include the www directory itself).
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True
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How would you dump the contents of the /var/log/messages file into standard output, grep for all lines that contain "Memory" and then redirect the grep'ed result to /home/user/log. txt?
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cat /var/log/messages | grep -i memory > /home/user/log. txt
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You need to search for man pages that relate to the postfix service. Which command will do this?
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whatis postfix, apropos postfix
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How would you append the text "service=on" to the /etc/motd file?
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echo "service=on" >> /etc/motd
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You need to set the execute bit on the finance directory and any subdirectories it might contain, but not on the files within them. This change must apply to all users. What methods might you use?
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chmod a+X -R finance, chmod -R a+X finance
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Which directory contains the info files from which the info program reads?
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/usr/share/info
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Display first ten lines of the file
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head
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Display first fifty lines of the file
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head -n 50
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Display last ten lines of the file
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tail
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Add next line to the file i.e. to /varlog/messages when new log comes
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tail -f /var/log/messages
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Display all lines starting with #
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grep '^#'
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Display a word with either capital or small letter
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grep -i <word>
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Search and display word in a file
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grep 'user' /etc/passwd
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Search and display everything but the word in the file
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grep -v 'slowo' /etc/passwd
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Find a word in results of dmesg command
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dmesg | grep slowo
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Find a line in a file where 'word' is at the end on the line
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grep 'word$' /etc/passwd
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Find lines starting and ending with linuxacademy
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grep -I '^linuxacademy&' /etc/passwd
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Find a line without letters o and a
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grep '[^oa]' /var/log/messages
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Regular expression -?
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Item is optional
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Regular expression - +
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Item exists once or more times in line
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Fine a latter which appears once or more in the line
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grep -E '(a)+' <filename>
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