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CLASS="PROGRAMLISTING"
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> 1 #!/bin/bash
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2 # list-glob.sh: Generating [list] in a for-loop, using "globbing"
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7 # ^ Bash performs filename expansion
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8 #+ on expressions that globbing recognizes.
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10 ls -l "$file" # Lists all files in $PWD (current directory).
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11 # Recall that the wild card character "*" matches every filename,
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12 #+ however, in "globbing," it doesn't match dot-files.
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14 # If the pattern matches no file, it is expanded to itself.
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15 # To prevent this, set the nullglob option
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16 #+ (shopt -s nullglob).
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17 # Thanks, S.C.
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22 for file in [jx]*
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24 rm -f $file # Removes only files beginning with "j" or "x" in $PWD.
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25 echo "Removed file \"$file\"".
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2 # list-glob.sh: Generating [list] in a for-loop, using "globbing" ...
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3 # Globbing = filename expansion.
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8 # ^ Bash performs filename expansion
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9 #+ on expressions that globbing recognizes.
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11 ls -l "$file" # Lists all files in $PWD (current directory).
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12 # Recall that the wild card character "*" matches every filename,
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13 #+ however, in "globbing," it doesn't match dot-files.
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15 # If the pattern matches no file, it is expanded to itself.
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16 # To prevent this, set the nullglob option
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17 #+ (shopt -s nullglob).
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18 # Thanks, S.C.
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23 for file in [jx]*
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25 rm -f $file # Removes only files beginning with "j" or "x" in $PWD.
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26 echo "Removed file \"$file\"".
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7 for name in $(awk 'BEGIN{FS=":"}{print $1}' < "$PASSWORD_FILE" )
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8 # Field separator = : ^^^^^^
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9 # Print first field ^^^^^^^^
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10 # Get input from password file ^^^^^^^^^^^^^^^^^
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10 # Get input from password file /etc/passwd ^^^^^^^^^^^^^^^^^
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12 echo "USER #$n = $name"
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13 let "n += 1"
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26 # ----------
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27 # How is it that an ordinary user, or a script run by same,
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28 #+ can read /etc/passwd? (Hint: Check the /etc/passwd file permissions.)
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29 # Isn't this a security hole? Why or why not?</PRE
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29 # Is this a security hole? Why or why not?</PRE
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> 1 #!/bin/bash
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2 # symlinks.sh: Lists symbolic links in a directory.
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4 OUTFILE=symlinks.list # save file
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4 OUTFILE=symlinks.list # save-file
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6 directory=${1-`pwd`}
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7 # Defaults to current working directory,
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SRC="common/note.png"
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HREF="internal.html#KEYWORDREF"
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> command block. However,
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these may, in certain contexts, be omitted by framing the
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command block within <A
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HREF="special-chars.html#CODEBLOCKREF"
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CLASS="PROGRAMLISTING"
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> 1 for((n=1; n<=10; n++))
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4 echo -n "* $n *"
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10 # * 1 ** 2 ** 3 ** 4 ** 5 ** 6 ** 7 ** 8 ** 9 ** 10 *
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11 # And, echo $? returns 0, so Bash does not register an error.
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17 # But, note that in a classic for-loop: for n in [list] ...
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18 #+ a terminal semicolon is required.
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20 for n in 1 2 3
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21 { echo -n "$n "; }
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25 # Thank you, YongYe, for pointing this out.</PRE
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8 previous=$var1
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9 [ "$var1" != end ] # Keeps track of what $var1 was previously.
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10 # Four conditions on "while", but only last one controls loop.
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10 # Four conditions on *while*, but only the final one controls loop.
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11 # The *last* exit status is the one that counts.
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13 echo "Input variable #1 (end to exit) "
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