Sponsored Content
Top Forums Shell Programming and Scripting awk evaluating a string as a math expression Post 302841179 by Jotne on Wednesday 7th of August 2013 05:14:55 AM
Old 08-07-2013
This bash script
while read line;do echo $(($line));done < infile
reads the expression from the file, evaluate it and then print the result.
If you give us some clue of what the goal is, we could give more help.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

String math help needed

#!/usr/bin/ksh #LOGFILE=/var/opt/ixos/log/notification_warning.log #DAT1=/var/opt/ixos/monitor/percentages.dat #DAT2=/var/opt/ixos/monitor/mountpoints.dat THRESHOLD=75 #`rm $DAT1` #`rm $DAT2` `bdf | grep /var/opt/ixos | awk '{ print $4 }' | cut -f1 -d"%" > test.dat` `bdf | grep... (1 Reply)
Discussion started by: petachi
1 Replies

2. Shell Programming and Scripting

How can awk search a string without using regular expression?

Hello, Awk seem treat the pattern as regular expression, how can awk search not using regular expression? e.g. just represent for "", not "A" or "a" . I don't want to add backslash . (2 Replies)
Discussion started by: 915086731
2 Replies

3. UNIX for Dummies Questions & Answers

awk logic and math help

Hi, My file has 2 fields and millions of lines. variableStep chrom=Uextra span=25 201 0.5952 226 0.330693 251 0.121004 276 0.0736858 301 0.0646982 326 0.0736858 401 0.2952 426 0.230693 451 0.221004 476 0.2736858 Each field either has a... (6 Replies)
Discussion started by: wyarosh
6 Replies

4. Shell Programming and Scripting

awk math operation on two files

Hi, I need your help. I've got two files and i need to add 2nd line after occurrence of "Group No X" from data2.txt to 3rd line (after occurrence of "Group No X") from data1.txt. There is the same number of "Groups" in both files and the numbers of groups have the same pattern. data1.txt Group... (2 Replies)
Discussion started by: killerbee
2 Replies

5. Shell Programming and Scripting

Need help with AWK math

I am trying to do some math, so that I can compare the average of six numbers to a variable. Here is what it looks like (note that when I divide really big numbers, it isn't a real number): $ tail -n 6 named.stats | awk -F\, '{print$1}' 1141804 1140566 1139429 1134210 1084682 895045... (3 Replies)
Discussion started by: brianjb
3 Replies

6. Shell Programming and Scripting

awk math and csv output

Hi I have this list 592;1;Z:\WB\DOCS;/FS3_100G/FILER112/BU/MPS/DOCS;;;;\\FILER112\BUMPS-DOCS\;580,116,544,878 Bytes;656,561 ;77,560 592;2;Z:\WB\FOCUS;/FS3_100G/FILER112/BU/MPS/FOCUS;;;;\\FILER112\BUMPS-FOCUS\;172,430 Bytes;6 ;0 ... (12 Replies)
Discussion started by: nakaedu
12 Replies

7. Solaris

Korn shell - evaluating string gives wrong results due to limitations

Anyone ever seen this? Someone mentioned this the other day.... If you do, for instance, in korn shell, echo $(5.2+2.5), it gives the result of 6 regardless. Can't remember why but it was the limitation of the korn shell. (5 Replies)
Discussion started by: psychocandy
5 Replies

8. Shell Programming and Scripting

Count math using awk

Hi expert, I have log : TOTAL-TIME : 2125264636 DATA-BYTES-DOWN : 3766111307032 DATA-BYTES-UP : 455032157567 DL = (3766111307032/2125264636)/1024 = 1.73 UL = (455032157567/2125264636)/1024 = 0.21 I want the result : TOTAL = 1.94 ... (4 Replies)
Discussion started by: justbow
4 Replies

9. Shell Programming and Scripting

Math count %memory using awk

Hi expert, i have log this: Memory: 74410384 Memory: 75831176 Memory: 77961232 Memory: 77074656 Memory: 76086160 Memory: 77128592 Memory: 78045384 Memory: 76696040 Memory: 72401176 Memory: 72520016 Memory: 72137016 Memory: 73175832 Memory: 73034528 Memory: 71770736 Memory:... (4 Replies)
Discussion started by: justbow
4 Replies

10. UNIX for Dummies Questions & Answers

awk If expression - Return string if not true

Hi, I have the following txt file List_With_Duplicates.txt; a,1,1 b,3,4 c,5,2 d,6,1 e,3,3 f,3,7 When I run the command awk -F ',' '{if($2==$3){print $1","$2","$3}}' List_With_Duplicates.txt I get the following output; a,1,1 e,3,3 This works! as I've compared the 2nd & 3rd... (7 Replies)
Discussion started by: mmab
7 Replies
gpgwrap(1)						      General Commands Manual							gpgwrap(1)

NAME
gpgwrap - a small wrapper for gpg SYNOPSIS
gpgwrap -V gpgwrap -P [-v] [-i] [-a] [-p <file>] gpgwrap -F [-v] [-i] [-a] [-c] [-p <file>] [-o <name>] [--] <file> [<file> ... ] gpgwrap [-v] [-i] [-a] [-p <file>] [-o <name>] [--] gpg [gpg options] DESCRIPTION
The GNU Privacy Guard (gpg) supplies the option --passphrase-fd. This instructs gpg to read the passphrase from the given file descriptor. Usually this file descriptor is opened before gpg is executed via execvp(3). Exactly that is what gpgwrap is doing. The passphrase may be passed to gpgwrap in 4 ways: * as file path, whereat the passphrase is stored as plain text in the file * it is piped from another program to the stdin of gpgwrap * through the GPGWRAP_PASSPHRASE environment variable * gpgwrap prompts for it With no precautions the first point undermines the secure infrastructure gpg provides. But in pure batch oriented environments this may be what you want. Otherwise if you are willing to enter passphrases once and don't want them to be stored as plain text in a file gpg-agent is what you are looking for. Another security objection could be the use of the environment variable GPGWRAP_PASSPHRASE which contains the passphrase and may be read by other processes of the same user. OPTIONS
-V, --version Print out version and exit. -P, --print Get the passphrase and print it mangled to stdout. -F, --file Read gpg commands from the given files. If <file> is - it is read from stdin. Exactly one command per line is expected. The given line is handled in the following way: * In the first place the passphrase is mangled. This means that unusual characters are replaced by their backslash escaped octal numbers. * Secondly the mangled passphrase is stored in the environment variable GPGWRAP_PASSPHRASE. * "exec gpgwrap -- " is prepended to each line, before the result is passed as argument to "sh -c". -h, --help Print out usage information. -v, --verbose Increase verbosity level. -i, --interactive Always prompt for passphrase (ignores -p and the environment variable). -a, --ask-twice Ask twice if prompting for a passphrase. -c, --check-exit-code While reading gpg commands from a file, gpgwrap ignores per default the exit code of its child processes. This option enables the check of the exit code. If a child terminates abnormal or with an exit code not equal 0 gpgwrap stops immediately and does return with this exit code. See also section BUGS. -p <file>, --passphrase-file <file> Read passphrase from <file>. If <file> is - it is read from stdin. The passphrase is expected to be in plain text. If this option is not given the passphrase will be taken either from the environment variable GPGWRAP_PASSPHRASE or it will be prompted on the controlling tty if the environment variable is not set. -o <name>, --option-name <name> Specify the name of the "--passphrase-fd" option understood by the program to be executed. This is useful if you want to use gpg- wrap in combination with other programs than gpg. LIMITATIONS
The given passphrase is subject to several limitations depending on the way it was passed to gpgwrap: * There is a size limitation: the passphrase should be not larger than some kilobytes (examine the source code for the exact limit). * gpgwrap allows you to use all characters in a passphrase even 00, but this does not mean that gpg will accept it. gpg may reject your passphrase or may only read a part of it, if it contains characters like 12 (in C also known as ). * If you set the environment variable GPGWRAP_PASSPHRASE you should take special care with the backslash character, because gpgwrap uses backslash to escape octal numbers, (see option -F). Therefore write backslash itself as octal number: 134. EXAMPLES
1. gpgwrap -p /path/to/a/secret/file gpg -c -z 0 --batch --no-tty --cipher-algo blowfish < infile > outfile Read passphrase from /path/to/a/secret/file and execute gpg to do symmetric encryption of infile and write it to outfile. 2. gpgwrap -i -a gpg -c -z 0 --batch --no-tty --cipher-algo blowfish < infile > outfile Same as above except that gpgwrap prompts twice for the passphrase. 3. gpgwrap -F -i - <<EOL gpg --decrypt --batch --no-tty < "$HOME/infile1" > "$HOME/outfile1" gpg --decrypt --batch --no-tty < "$HOME/infile2" > "$HOME/outfile2" gpg --decrypt --batch --no-tty < "$HOME/infile3" > "$HOME/outfile3" gpg --decrypt --batch --no-tty < "$HOME/infile4" > "$HOME/outfile4" EOL gpgwrap prompts for the passphrase and executes four instances of gpg to decrypt the given files. 4. GPGWRAP_PASSPHRASE="mysecretpassphrase" export GPGWRAP_PASSPHRASE gpgwrap -F -c -v /tmp/cmdfile1 - /tmp/cmdfile2 <<EOL gpg --decrypt --batch --no-tty < "$HOME/infile1" > "$HOME/outfile1" gpg --decrypt --batch --no-tty < "$HOME/infile2" > "$HOME/outfile2" gpg --decrypt --batch --no-tty < "$HOME/infile3" > "$HOME/outfile3" gpg --decrypt --batch --no-tty < "$HOME/infile4" > "$HOME/outfile4" EOL Same as above except that gpgwrap gets the passphrase via the environment variable, reads commands additionally from other files and checks the exit code of every gpg instance. This means if one gpg command has a non zero exit code, no further commands are executed. Furthermore gpgwrap produces verbose output. 5. GPGWRAP_PASSPHRASE="$(gpgwrap -P -i -a)" export GPGWRAP_PASSPHRASE find . -maxdepth 1 -type f | while read FILE; do FILE2="$FILE.bz2.gpg" bzip2 -c "$FILE" | gpgwrap gpg -c -z 0 --batch --no-tty --cipher-algo blowfish > "$FILE2" && touch -r "$FILE" "$FILE2" && rm -f "$FILE" done Read in passphrase, compress all files in the current directory, encrypt them and keep date from original file. 6. find . -maxdepth 1 -type f -name '*.bz2.gpg' | awk '{ printf("gpg --decrypt --batch --no-tty --quiet "); printf("--no-secmem-warning < %s ", $0); }' | gpgwrap -F -i -c - | bzip2 -d -c - | grep -i 'data' Decrypt all *.bz2.gpg files in the current directory, decompress them and print out all occurances of data. If you pipe the result to less you get into trouble because gpgwrap and less try to read from the TTY at the same time. In such a case it is better to use the environment variable to give the passphrase (the example above shows how to do this). 7. GPGWRAP_PASSPHRASE="$(gpgwrap -P -i -a)" export GPGWRAP_PASSPHRASE gpgwrap -P | ssh -C -x -P -l user host " GPGWRAP_PASSPHRASE="$(cat)" ... " Prompt for a passphrase twice and write it to the GPGWRAP_PASSPHRASE environment variable. 8. echo -n "Passphrase: " stty -echo read GPGWRAP_PASSPHRASE echo stty echo export GPGWRAP_PASSPHRASE Another way to prompt manually for the passphrase. It was needed in combination with older versions of gpgwrap, because they did not upport -P. Be aware that with this method no automatic conversion to backslash escaped octal numbers takes place. 9. echo "mysecretpassphrase" | gpg --batch --no-tty --passphrase-fd 0 --output outfile --decrypt infile Cheap method to give passphrase to gpg without gpgwrap. Note that you can't use stdin to pass a file to gpg, because stdin is already used for the passphrase. 10. gpg --batch --no-tty --passphrase-fd 3 3< /path/to/a/secret/file < infile > outfile This is a more advanced method to give the passphrase, it is equivalent to Option -p of gpgwrap. This example should at least work with the bash. 11. gpg --batch --no-tty --passphrase-fd 3 3< <(echo "mysecretpassphrase") < infile > outfile Like above, but the passphrase is given directly. This example should at least work with the bash. BUGS
In version 0.02 of gpgwrap the exit code of gpg was only returned if gpgwrap read the passphrase from a file. Since version 0.03, only -F omits exit code checking by default, but it can be enabled with -c. SEE ALSO
gpg, gpg-agent AUTHOR
Karsten Scheibler gpgwrap 0.04 gpgwrap(1)
All times are GMT -4. The time now is 04:32 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy