Unix tool tip

@UnixToolTip

Tips on Unix utilities and related topics from .

Vrijeme pridruživanja: kolovoz 2011.

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  1. Prikvačeni tweet
    22. svi 2015.

    'The enjoyment of one's tools is an essential ingredient of successful work.' -- Donald E. Knuth

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  2. prije 12 sati

    A sed script basically consists of addresses and commands. Addresses specify where, commands specify what.

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  3. 2. velj

    Writing Safe Shell Scripts

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  4. 31. sij

    To do a search by file names using find, -name is case-sensitive and -iname is case-insensitive.

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  5. 30. sij

    tac is like cat, only backward.

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  6. 29. sij

    Print the first seven lines of a file using sed: sed 7q <file>.

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  7. proslijedio/la je Tweet
    28. sij

    network protocols

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  8. 28. sij

    By default, the head command shows the first 10 lines of a file. Can be modified using -n followed by the number of lines to show.

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  9. 27. sij

    To search for directories with find, specify -type d. To search for files, specify -type f.

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  10. 24. sij
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  11. 23. sij

    In awk jargon, each line of a file is a record. You can change the way awk splits files into records, but by default it splits on newlines.

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  12. 22. sij

    Bash et al are quirky as programming languages because first and foremost they are command interpreters, not programming languages. They are not programming languages that launch commands. They are command launchers that have a programming language.

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  13. 22. sij

    Why can you not have spaces around an equal sign in a shell variable assignment statement? The shell knows that commands don't have equal signs inside, so "foo=bar" is not a command. But in "foo = bar" the foo might be a command.

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  14. 22. sij

    Capitalize all vowels in a file: sed 'y/aeiou/AEIOU/' somefile

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  15. 22. sij

    "TLDR pages are a community effort to simplify the beloved man pages with practical examples."

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  16. 21. sij

    tail -F will monitor a file, such as a log file, until you type Ctrl-c.

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  17. proslijedio/la je Tweet
    19. sij

    ⏲️ As of today, we have about eighteen years to go until the Y2038 problem occurs. But the Y2038 problem will be giving us headaches long, long before 2038 arrives. I'd like to tell you a story about this.

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  18. 20. sij

    Vertically align code around = signs using Emacs: M-x align-regex =

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  19. 17. sij

    mv -i moves files, asking for confirmation before overwriting an existing file.

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  20. 17. sij

    Splitting lines and numbering the pieces

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  21. 17. sij
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