Sponsored Content
Top Forums Programming awk processing / Shell Script Processing to remove columns text file Post 302784893 by ajayram on Saturday 23rd of March 2013 01:03:35 PM
Old 03-23-2013
Thanks

Hello,

Thank you for helping me out. It works..Smilie

---------- Post updated at 07:03 PM ---------- Previous update was at 06:00 PM ----------

Hello,

So I ran this Awk code in the end

Code:
awk '{print substr($0,7)}' filelist

through the shell like this : I wanted the output to get redirected to the same file as the input
thus,

Code:
[milli@milli ~]$ sh test.awk > filelist

I expected to see the filelist overwritten with the new input from the Results of the Shell Script, however, it produces a blank file.

If I give this command
Code:
[milli@milli ~]$ sh test.awk >> filelist

Then it gets appended as usual.

If I try a different filename for output redirection , then it works properly.

Any idea what is happening ?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

text processing ( sed/awk)

hi.. I have a file having record on in 1 line.... I want every 400 characters in a new line... means in 1st line 1-400 in 2nd line - 401-800 etc pl help. (12 Replies)
Discussion started by: clx
12 Replies

2. Shell Programming and Scripting

KSH script -text file processing NULL issues

I'm trying to strip any garbage that may be at the end of my text file and that part is working. The problem only seems to be with the really long lines in the file. When the head command is executed I am directing the output to a new file. The new file always get a null in the 4096 position but... (2 Replies)
Discussion started by: geauxsaints
2 Replies

3. Shell Programming and Scripting

awk, perl Script for processing a single line text file

I need a script to process a huge single line text file: The sample of the text is: "forward_inline_item": "Inline", "options_region_Australia": "Australia", "server_event_err_msg": "There was an error attempting to save", "Token": "Yes", "family": "Family","pwd_login_tab": "Enter Your... (1 Reply)
Discussion started by: hmsadiq
1 Replies

4. Shell Programming and Scripting

2 file processing script in C shell

I want to use an awk for the following scenario but not sure if it will work or not. I have two input file: F1 and F2 F1 02 05 08 F2 00 01 02 03 04 05 06 07 08 09 10 (1 Reply)
Discussion started by: jclanc8
1 Replies

5. Shell Programming and Scripting

Awk text processing

Hi Very much appreciate if somebody could give me a clue .. I undestand that it could be done with awk but have a limited experience. I have the following text in the file 1 909 YES NO 2 500 No NO . ... 1 ... (8 Replies)
Discussion started by: zam
8 Replies

6. Shell Programming and Scripting

File Processing in shell script

i have a file with following type of data abcd : gggggg gggggg ; 1234 gggggg ; 5678 gggggg ; 3434 gggggg ; 6565 gggggg ; 1231 1234 ; vvvv ;Eng=Myfirstname 5678 ; xyzf ;Eng=Mysecondname 3434 ; xyzf ;Eng=Mythirdname 6565 ; xyzf ;Eng=Mysfourthname 1231 ; xyzf ;Eng=Mysfifthname... (7 Replies)
Discussion started by: telangmadhuri
7 Replies

7. Shell Programming and Scripting

AWK: Remove spaces before processing each line?

Hi, all I have a file containing the following data: name: PRODUCT_1 date: 2010-01-07 really_long_name: PRODUCT_ABCDEFG I want to get the date (it is "2010-01-07" here), I could use the following code to do that: awk... (6 Replies)
Discussion started by: kevintse
6 Replies

8. Shell Programming and Scripting

Text processing using awk

I dispose of two tab-delimited files (the first column is the primary key): File 1 (there are multiple rows sharing the same key, I cannot merge them) A 28,29,30,31 A 17,18,19 B 11,13,14,15 B 8,9File 2 (there is one only row beginning with a given key) A 2,8,18,30,31 B ... (3 Replies)
Discussion started by: dovah
3 Replies

9. Shell Programming and Scripting

Text columns processing using awk

P { margin-bottom: 0.25cm; line-height: 120%; }CODE.cjk { font-family: "WenQuanYi Micro Hei",monospace; }CODE.ctl { font-family: "Lohit Hindi",monospace; }A:link { } I'm trying to build an awk statement to print from a file (file1): A 1,2,3 * A 4,5,6 ** B 1 ... (4 Replies)
Discussion started by: dovah
4 Replies

10. Shell Programming and Scripting

awk for text processing

Hi,my file is in this format ", \"symbol\": \"Rbm38\" } ]" I want to convert it to a more user readable format _id pubmed text symbol 67196 18667844 Overexpression of UBE2T in NIH3T3 cells significantly promoted colony formation in mouse cell cultures Ube2t 56190 21764855 ... (3 Replies)
Discussion started by: biofreek
3 Replies
cut(1)							      General Commands Manual							    cut(1)

Name
       cut - cut out selected fields of each line of a file

Syntax
       cut -clist [file1 file2...]
       cut -flist [-dchar] [-s] [file1 file2...]

Description
       Use  the  command to cut out columns from a table or fields from each line of a file.  The fields as specified by list can be fixed length,
       that is, character positions as on a punched card (-c option), or the length can vary from line to line and be marked with a  field  delim-
       iter character like tab (-f option).  The command can be used as a filter.  If no files are given, the standard input is used.

       Use to make horizontal ``cuts'' (by context) through a file, or to put files together in columns.  To reorder columns in a table, use and

Options
       list	   Specifies  ranges  that must be a comma-separated list of integer field numbers in increasing order.  With optional - indicates
		   ranges as in the -o option of nroff/troff for page ranges; for example, 1,4,7; 1-3,8; -5,10 (short for 1-5,10);  or	3-  (short
		   for third through last field).

       -clist	   Specifies character positions to be cut out.  For example, -c1-72 would pass the first 72 characters of each line.

       -flist	   Specifies  the  fields  to be cut out.  For example, -f1,7 copies the first and seventh field only.	Lines with no field delim-
		   iters are passed through intact (useful for table subheadings), unless -s is specified.

       -dchar	   Uses the specified character as the field delimiter.  Default is tab.  Space or other characters with special  meaning  to  the
		   shell must be quoted.  The -d option is used only in combination with the -f option, according to XPG3 and SVID2/SVID3.

       -s	   Suppresses  lines  with  no	delimiter  characters.	 Unless  specified, lines with no delimiters are passed through untouched.
		   Either the -c or -f option must be specified.

Examples
       Mapping of user IDs to names:
       cut -d: -f1,5 /etc/passwd
       To set name to the current login name for the csh shell:
       set name=`who am i | cut -f1 -d" "`
       To set name to the current login name for the sh, sh5, and ksh shells:
       name=`who am i | cut -f1 -d" "`

Diagnostics
       "line too long"	   A line can have no more than 511 characters or fields.

       "bad list for c/f option"
			   Missing -c or -f option or incorrectly specified list.  No error occurs if a line has fewer fields than the list  calls
			   for.

       "no fields"	   The list is empty.

See Also
       grep(1), paste(1)

																	    cut(1)
All times are GMT -4. The time now is 08:39 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy