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The time now is Sat 25 May 2013, 06:18 All times are UTC - 4 |
 Forum index » Off-Topic Area » Programming |
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7 tips worth their weight in bash
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droope
 Joined: 31 Jul 2008 Posts: 814 Location: Uruguay, Mercedes |
Hi people! Check this out http://ad.hominem.org/log/2006/02/7_bash_tips.php You won't regret it. 
Regards, Droope _________________ What seems hard is actually easy, while what looks like impossible is in fact hard. “Hard things take time to do. Impossible things take a little longer.” –Percy Cerutty Mi blog (Spanish) |
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ken geometrics
Joined: 23 Jan 2009 Posts: 76 Location: California |
On the find commands you need to put quotes around the wild carded file names. If you don't, bash may find a file that matches the name in the current directory. |
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piratesmack
 Joined: 16 Sep 2009 Posts: 100 |
Thanks for posting this. I learned a few things
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technosaurus
 Joined: 18 May 2008 Posts: 3843 |
works great for a firstrun script or anything that should only be done once here are some more: Command Description Example & Run the previous command in the background ls & && Logical AND if [ "$foo" -ge "0" ] && [ "$foo" -le "9"] || Logical OR if [ "$foo" -lt "0" ] || [ "$foo" -gt "9" ] (not in Bourne shell) ^ Start of line grep "^foo" $ End of line grep "foo$" = String equality (cf. -eq) if [ "$foo" = "bar" ] ! Logical NOT if [ "$foo" != "bar" ] $$ PID of current shell echo "my PID = $$" $! PID of last background command ls & echo "PID of ls = $!" $? exit status of last command ls ; echo "ls returned code $?" $0 Name of current command (as called) echo "I am $0" $1 Name of current command's first parameter echo "My first argument is $1" $9 Name of current command's ninth parameter echo "My ninth argument is $9" $@ All of current command's parameters (preserving whitespace and quoting) echo "My arguments are $@" $* All of current command's parameters (not preserving whitespace and quoting) echo "My arguments are $*" -eq Numeric Equality if [ "$foo" -eq "9" ] -ne Numeric Inquality if [ "$foo" -ne "9" ] -lt Less Than if [ "$foo" -lt "9" ] -le Less Than or Equal if [ "$foo" -le "9" ] -gt Greater Than if [ "$foo" -gt "9" ] -ge Greater Than or Equal if [ "$foo" -ge "9" ] -z String is zero length if [ -z "$foo" ] -n String is not zero length if [ -n "$foo" ] -nt Newer Than if [ "$file1" -nt "$file2" ] -d Is a Directory if [ -d /bin ] -f Is a File if [ -f /bin/ls ] -r Is a readable file if [ -r /bin/ls ] -w Is a writable file if [ -w /bin/ls ] -x Is an executable file if [ -x /bin/ls ] parenthesis: ( ... ) Function definition function myfunc() { echo hello } the && || combo is great for replacing a hierachy type of nested ifs [ a -lt 5 ] && command1 || [ a -lt 10 ] && command2 || [ a -lt 22 ] && command3 || echo "a is greater than or equal to 22 - bust" && exit putting that in a properly formatted if then else setup would be 10 lines and difficult to read, but case is a little better if you use regular expressions case a in [0-4])cmd1;; [5-9])cmd2;; 1[0-9]|2[0,1])cmd3;; *)echo bust;; #install all rpms in the current directory (good template for other tasks though) for x in `ls ./*rpm`; do rpm2cpio $x | cpio -ivd; done esac _________________ Puppy Web Desktop Now with pet packages - Pet Packaging 100 & 101 |
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7 tips worth their weight in bash
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