Reading a file one line at a time Post: 25105

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1. Shell Programming and Scripting

Reading one line at a time

Hi All, I'm trying to write an script where I'll be processing all the lines of an input file but one line at a time and produce a written output for each processed line. Where I'm having problems is preparing the loop where I check a the first line of the input file cut some bytes out of the...

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reading a file inside awk and processing line by line

Hi Sorry to multipost. I am opening the new thread because the earlier threads head was misleading to my current doubt. and i am stuck. list=`cat /u/Test/programs`; psg "ServTest" | awk -v listawk=$list '{ cmd_name=($5 ~ /^/)? $9:$8 for(pgmname in listawk) ...

3. Shell Programming and Scripting

[Solved] Problem in reading a file line by line till it reaches a white line

So, I want to read line-by-line a text file with unknown number of files.... So: a=1 b=1 while ; do b=`sed -n '$ap' test` a=`expr $a + 1` $here do something with b etc done the problem is that sed does not seem to recognise the $a, even when trying sed -n ' $a p' So, I cannot read...

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Parsing file, reading each line to variable, evaluating date/time stamp of each line

So, the beginning of my script will cat & grep a file with the output directed to a new file. The data I have in this file needs to be parsed, read and evaluated. Basically, I need to identify the latest date/time stamp and then calculate whether or not it is within 15 minutes of the current...

5. Shell Programming and Scripting

How to start reading from the nth line till the last line of a file.

Hi, For my reuirement, I have to read a file from the 2nd line till the last line<EOF>. Say, I have a file as test.txt, which as a header record in the first line followed by records in rest of the lines. for i in `cat test.txt` { echo $i } While doing the above loop, I have read...

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Reading text file, comparing a value in a line, and placing only part of the line in a variable?

I need some help. I would like to read in a text file. Take a variable such as ROW-D-01, compare it to what's in one line in the text file such as PROD/VM/ROW-D-01 and only input PROD/VM into a variable without the /ROW-D-01. Is this possible? any help is appreciated.

7. Shell Programming and Scripting

Comparison of fields then increment a counter reading line by line in a file

Hi, i have a scenario were i should compare a few fields from each line then increment a variable based on that. Example file 989878|8999|Y|0|Y|N|V 989878|8999|Y|0|N|N|V 989878|8999|Y|2344|Y|N|V i have 3 conditions to check and increment a variable on every line condition 1 if ( $3...

8. Shell Programming and Scripting

Reading line by line from live log file using while loop and considering only those lines start from

Hi, I want to read a live log file line by line and considering those line which start from time stamp; Below code I am using, which read line but throws an exception when comparing line that does not contain error code tail -F /logs/COMMON-ERROR.log | while read myline; do...

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Reading a file line by line and print required lines based on pattern

Hi All, i want to write a shell script read below file line by line and want to exclude the lines which contains empty value for MOUNTPOINT field. i am using centos 7 Operating system. want to read below file. # cat /tmp/d5 NAME="/dev/sda" TYPE="disk" SIZE="60G" OWNER="root"...

LEARN ABOUT LINUX

bzexe

BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME

       bzexe - compress executable files in place

SYNOPSIS

       bzexe [ name ...  ]

DESCRIPTION

       The  bzexe  utility  allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
       penalty in performance).  For example if you execute ``bzexe /bin/cat'' it will create the following two files:
	   -r-xr-xr-x  1 root  bin   9644 Feb 11 11:16 /bin/cat
	   -r-xr-xr-x  1 bin   bin  24576 Nov 23 13:21 /bin/cat~
       /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file.  You can remove /bin/cat~ once  you  are	sure  that
       /bin/cat works properly.

       This utility is most useful on systems with very small disks.

OPTIONS

       -d     Decompress the given executables instead of compressing them.

SEE ALSO

       bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1)

CAVEATS

       The  compressed	executable  is a shell script. This may create some security holes. In particular, the compressed executable relies on the
       PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep).

BUGS

       bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually  in  some  cases,
       using chmod or chown.

																	  BZEXE(1)