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insert "_" before uppercase letter with awk

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Top Forums Shell Programming and Scripting insert "_" before uppercase letter with awk
# 8  
Old 04-06-2011
Quote:
Originally Posted by bartus11
No idea. It is weird for me too.
Seems to be a local problem, change the LANG variable before launching awk:
Code:
LANG=C awk '{....}'

# 9  
Old 04-06-2011
As stated by Karel Zak on https://partner-bugzilla.redhat.com/....cgi?id=222270 :
-----------------------------------------------------------------------------------------------------------
The [a-z] defines range and not class of chars. It doesn't work correctly with
i18n environment, because locale sequence is defined as [aAbBcC..zZ] -- so [A-Z]
= [AbBCc..zZ].

You have to use [[:upper:]] or [[:lower:]]. (The old gawk 3.0.3 doesn't support
locales)
-----------------------------------------------------------------------------------------------------------

Code:
# gawk --version | head -2
GNU Awk 3.1.1
Copyright © 1998, 1991-2002 Free Software Foundation, Inc.

Code:
# echo 'aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ' | gawk '{gsub("[A-Z]","_&",$0)}1' IGNORECASE=0
a_A_b_B_c_C_d_D_e_E_f_F_g_G_h_H_i_I_j_J_k_K_l_L_m_M_n_N_o_O_p_P_q_Q_r_R_s_S_t_T_u_U_v_V_w_W_x_X_y_Y_z_Z
# echo 'aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ' | gawk '{gsub("[A-Z]","_&",$0)}1' IGNORECASE=1
_a_A_b_B_c_C_d_D_e_E_f_F_g_G_h_H_i_I_j_J_k_K_l_L_m_M_n_N_o_O_p_P_q_Q_r_R_s_S_t_T_u_U_v_V_w_W_x_X_y_Y_z_Z
#

Note the missing starting _ when IGNORECASE=0
Last edited by ctsgnb; 04-06-2011 at 01:38 PM..
# 10  
Old 04-07-2011
Lightbulb
Interesting, I'm running linux with GNU Awk 3.1.7 and LANG=C is good. Locales are a funny thing...thanks everybody Smilie
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