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Top Forums UNIX for Dummies Questions & Answers PS1 (Prompt character) appearing in cat output Post 302821081 by omega3 on Friday 14th of June 2013 03:36:39 AM
Old 06-14-2013
PS1 (Prompt character) appearing in cat output

RedHat Linux 5.8/Korn Shell

I have text file name /etc/oracle/config.loc. It has the following text
Code:
#Device/file  getting replaced by device +OCR
ocrconfig_loc=+DATA
ocrmirrorconfig_loc=+OCR

But , when I open this file using cat , the PS1 character (for prompt) appears as the last character in the last line

Code:
$ PS1='> '
>
> cat /etc/oracle/config.loc
#Device/file  getting replaced by device +OCR
ocrconfig_loc=+DATA
ocrmirrorconfig_loc=+OCR
local_only=false>

Changing PS1 to $ sign. As you can see below the dollar sign appears in cat output in the last line

Code:
> PS1='$ '
$
$
$ cat /etc/oracle/config.loc
#Device/file  getting replaced by device +OCR
ocrconfig_loc=+DATA
ocrmirrorconfig_loc=+OCR
local_only=false$

But it doesn't happen for all files. For instance, PS1 character doesn't appear in the below file abc.txt
Code:
$ cat abc.txt
hello world

Why is this happening ? How can I fix this ?
 

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is  a  text formatter.	Its input consists of the text to be out-
put, intermixed with formatting commands.  A  formatting  command
is  a  line  containing  the  control character followed by a two
character command name, and possibly one or more arguments.   The
control  character is initially . (dot).  The formatted output is
produced on standard output.  The formatting commands are  listed
below, with being a number, being a character, and being a title.
A + before n means it may be signed,  indicating  a  positive  or
negative change from the current value.  Initial values for where
relevant, are given in parentheses.
  .ad	  Adjust right margin.
  .ar	  Arabic page numbers.
  .br	  Line break.  Subsequent text will begin on a new line.
  .bl n   Insert n blank lines.
  .bp +n  Begin new page and number it n. No n means +1.
  .cc c   Control character is set to c.
  .ce n   Center the next n input lines.
  .de zz  Define a macro called zz. A line with .. ends definition.
  .ds	  Double space the output. Same as .ls 2.
  .ef t   Even page footer title is set to t.
  .eh t   Even page header title is set to t.
  .fi	  Begin filling output lines as full as possible.
  .fo t   Footer titles (even and odd) are set to t.
  .hc c   The character c (e.g., %) tells roff where hyphens are permitted.
  .he t   Header titles (even and odd) are set to t.
  .hx	  Header titles are suppressed.
  .hy n   Hyphenation is done if n is 1, suppressed if it is 0. Default is 1.
  .ig	  Ignore input lines until a line beginning with .. is found.
  .in n   Indent n spaces from the left margin; force line break.
  .ix n   Same as .in but continue filling output on current line.
  .li n   Literal text on next n lines.  Copy to output unmodified.
  .ll +n  Line length (including indent) is set to n (65).
  .ls +n  Line spacing: n (1) is 1 for single spacing, 2 for double, etc.
  .m1 n   Insert n (2) blank lines between top of page and header.
  .m2 n   Insert n (2) blank lines between header and start of text.
  .m3 n   Insert n (1) blank lines between end of text and footer.
  .m4 n   Insert n (3) blank lines between footer and end of page.
  .na	  No adjustment of the right margin.
  .ne n   Need n lines.  If fewer are left, go to next page.
  .nn +n  The next n output lines are not numbered.
  .n1	  Number output lines in left margin starting at 1.
  .n2 n   Number output lines starting at n.  If 0, stop numbering.
  .ni +n  Indent line numbers by n (0) spaces.
  .nf	  No more filling of lines.
  .nx f   Switch input to file f.
  .of t   Odd page footer title is set to t.
  .oh t   Odd page header title is set to t.
  .pa +n  Page adjust by n (1).  Same as .bp
  .pl +n  Paper length is n (66) lines.
  .po +n  Page offset.	Each line is started with n (0) spaces.
  .ro	  Page numbers are printed in Roman numerals.
  .sk n   Skip n pages (i.e., make them blank), starting with next one.
  .sp n   Insert n blank lines, except at top of page.
  .ss	  Single spacing.  Equivalent to .ls 1.
  .ta	  Set tab stops, e.g., .ta 9 17 25 33 41 49 57 65 73 (default).
  .tc c   Tabs are expanded into c.  Default is space.
  .ti n   Indent next line n spaces; then go back to previous indent.
  .tr ab  Translate a into b on output.
  .ul n   Underline the letters and numbers in the next n lines.
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