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Full Discussion: how to change IFS in arrays
Top Forums Shell Programming and Scripting how to change IFS in arrays Post 302256651 by joeyg on Monday 10th of November 2008 10:06:37 AM
Old 11-10-2008
Hammer & Screwdriver

echo "$IFS" will show you what is in there.
However, you might be better with
echo "$IFS" | od -b
since you will now see
0000000 040 011 012 012
meaning, 040=space and 011=tab and 012=LF and echo gives the last 012

To change,
IFS=:
would change to colon

In programming, you might want to save the current IFS
curr_ifs=$IFS
do whatever, and then put it back
IFS=$curr_ifs

[although I did not test that above syntax yet]
 

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ascii(5)							File Formats Manual							  ascii(5)

NAME
ascii - map of ASCII character set SYNOPSIS
DESCRIPTION
The file provides a map of the ASCII character set, giving both octal and hexadecimal equivalents of each character. The file contains the following text: |000 nul|001 soh|002 stx|003 etx|004 eot|005 enq|006 ack|007 bel| |010 bs |011 ht |012 nl |013 vt |014 np |015 cr |016 so |017 si | |020 dle|021 dc1|022 dc2|023 dc3|024 dc4|025 nak|026 syn|027 etb| |030 can|031 em |032 sub|033 esc|034 fs |035 gs |036 rs |037 us | |040 sp |041 ! |042 " |043 # |044 $ |045 % |046 & |047 ' | |050 ( |051 ) |052 * |053 + |054 , |055 - |056 . |057 / | |060 0 |061 1 |062 2 |063 3 |064 4 |065 5 |066 6 |067 7 | |070 8 |071 9 |072 : |073 ; |074 < |075 = |076 > |077 ? | |100 @ |101 A |102 B |103 C |104 D |105 E |106 F |107 G | |110 H |111 I |112 J |113 K |114 L |115 M |116 N |117 O | |120 P |121 Q |122 R |123 S |124 T |125 U |126 V |127 W | |130 X |131 Y |132 Z |133 [ |134 |135 ] |136 ^ |137 _ | |140 ` |141 a |142 b |143 c |144 d |145 e |146 f |147 g | |150 h |151 i |152 j |153 k |154 l |155 m |156 n |157 o | |160 p |161 q |162 r |163 s |164 t |165 u |166 v |167 w | |170 x |171 y |172 z |173 { |174 | |175 } |176 ~ |177 del| | 00 nul| 01 soh| 02 stx| 03 etx| 04 eot| 05 enq| 06 ack| 07 bel| | 08 bs | 09 ht | 0a nl | 0b vt | 0c np | 0d cr | 0e so | 0f si | | 10 dle| 11 dc1| 12 dc2| 13 dc3| 14 dc4| 15 nak| 16 syn| 17 etb| | 18 can| 19 em | 1a sub| 1b esc| 1c fs | 1d gs | 1e rs | 1f us | | 20 sp | 21 ! | 22 " | 23 # | 24 $ | 25 % | 26 & | 27 ' | | 28 ( | 29 ) | 2a * | 2b + | 2c , | 2d - | 2e . | 2f / | | 30 0 | 31 1 | 32 2 | 33 3 | 34 4 | 35 5 | 36 6 | 37 7 | | 38 8 | 39 9 | 3a : | 3b ; | 3c < | 3d = | 3e > | 3f ? | | 40 @ | 41 A | 42 B | 43 C | 44 D | 45 E | 46 F | 47 G | | 48 H | 49 I | 4a J | 4b K | 4c L | 4d M | 4e N | 4f O | | 50 P | 51 Q | 52 R | 53 S | 54 T | 55 U | 56 V | 57 W | | 58 X | 59 Y | 5a Z | 5b [ | 5c | 5d ] | 5e ^ | 5f _ | | 60 ` | 61 a | 62 b | 63 c | 64 d | 65 e | 66 f | 67 g | | 68 h | 69 i | 6a j | 6b k | 6c l | 6d m | 6e n | 6f o | | 70 p | 71 q | 72 r | 73 s | 74 t | 75 u | 76 v | 77 w | | 78 x | 79 y | 7a z | 7b { | 7c | | 7d } | 7e ~ | 7f del| Control Characters The following table shows the set of ASCII control characters with their octal, decimal, and hexadecimal values. To obtain the respective characters from the keyboard, use the indicated keypress combinations. To place control characters in a file when using the or editor, type Ctrl-before typing the desired control character. +----+-----+-----+---------+--------+------------------------+--------------+ |Oct | Dec | Hex | Display | Symbol | Char Name | Keypress | +----+-----+-----+---------+--------+------------------------+--------------+ |000 | 000 | 00 | none | NUL | Null | Ctrl-Shift-@ | |001 | 001 | 01 | ^A | SOH | Start of Header | Ctrl-A | |002 | 002 | 02 | ^B | STX | Start of Text | Ctrl-B | |003 | 003 | 03 | ^C | ETX | End of Text | Ctrl-C | |004 | 004 | 04 | ^D | EOT | End of Transmission | Ctrl-D | |005 | 005 | 05 | ^E | ENQ | Enquire | Ctrl-E | |006 | 006 | 06 | ^F | ACK | Acknowledge | Ctrl-F | |007 | 007 | 07 | ^G | BEL | Bell | Ctrl-G | +----+-----+-----+---------+--------+------------------------+--------------+ |010 | 008 | 08 | ^H | BS | Back Space | Ctrl-H | |011 | 009 | 09 | ^I | HT | Horizontal Tab | Ctrl-I | |012 | 010 | 0A | ^J | LF | Line Feed | Ctrl-J | |013 | 011 | 0B | ^K | VT | Vertical Tab | Ctrl-K | |014 | 012 | 0C | ^L | FF | Form Feed | Ctrl-L | |015 | 013 | 0D | ^M | CR | Carriage Return | Ctrl-M | |016 | 014 | 0E | ^N | SO | Shift Out | Ctrl-N | |017 | 015 | 0F | ^O | SI | Shift In | Ctrl-O | +----+-----+-----+---------+--------+------------------------+--------------+ |020 | 016 | 10 | ^P | DLE | Data Link Escape | Ctrl-P | |021 | 017 | 11 | ^Q | DC1 | Device Control 1 | Ctrl-Q | |022 | 018 | 12 | ^R | DC2 | Device Control 2 | Ctrl-R | |023 | 019 | 13 | ^S | DC3 | Device Control 3 | Ctrl-S | |024 | 020 | 14 | ^T | DC4 | Device Control 4 | Ctrl-T | |025 | 021 | 15 | ^U | NAK | Negative Acknowledge | Ctrl-U | |026 | 022 | 16 | ^V | SYN | Synchronize | Ctrl-V | |027 | 023 | 17 | ^W | ETB | End Transmission Block | Ctrl-W | +----+-----+-----+---------+--------+------------------------+--------------+ |030 | 024 | 18 | ^X | CAN | Cancel | Ctrl-X | |031 | 025 | 19 | ^Y | EM | End of Medium | Ctrl-Y | |032 | 026 | 1A | ^Z | SUB | Substitute | Ctrl-Z | |033 | 027 | 1B | ^[ | ESC | Escape | Ctrl-[ | |034 | 028 | 1C | ^ | FS | File Separator | Ctrl- | |035 | 029 | 1D | ^] | GS | Group Separator | Ctrl-] | |036 | 030 | 1E | ^^ | RS | Record Separator | Ctrl-Shift-^ | |037 | 031 | 1F | ^_ | US | Unit Separator | Ctrl-Shift-_ | +----+-----+-----+---------+--------+------------------------+--------------+ |177 | 127 | 7F | ^? | DEL | Delete | DEL | +----+-----+-----+---------+--------+------------------------+--------------+ WARNINGS
Note that some HP-UX subsystems, such as the keyboard interface, window systems, and other system software, may use selected keyboard con- trol characters for special purposes, possibly causing unexpected results. FILES
ascii(5)
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